МАГНИТНАЯ ФОРМА ДЛЯ ПЕЧАТАНИЯ ОПТИЧЕСКИХ ЭФФЕКТОВ

Изобретение относится к области полиграфии. Магнитная печатная форма содержит лист или блок из намагничиваемого композиционного материала, имеющий множество областей, расположенных по его поверхности. При этом первая область на указанной поверхности намагничена путем воздействия магнитным полем с помощью намагничивающей матрицы определенной формы, имеющей наружную поверхность в виде изображения, логотипа или обозначения. Причем первая область намагничена таким образом, что она имеет форму, соответствующую указанному изображению, логотипу или обозначению, и создает первое магнитное поле с заданным направлением, а вторая область на поверхности листа или блока, окружающая указанную первую область, либо не намагничена, либо намагничена по-другому по сравнению с первой областью, благодаря чему обеспечивается контраст между создаваемыми или магнитными полями. Заявленная группа изобретений позволяет упростить изготовление магнита и повысить степень гибкости в отношении магнитного поля, создаваемого ...

СПОСОБ ЗАПИСИ И ВОСПРОИЗВЕДЕНИЯ ИНФОРМАЦИИ НА МАГНИТНЫХ ПОЛОСАХ И СООТВЕТСТВУЮЩЕЕ УСТРОЙСТВО СЧИТЫВАНИЯ/ЗАПИСИ

Изобретение относится к способу и устройству для воспроизведения звукового и/или видеосигнала, записанного на магнитной полосе. Последовательность меток времени распределена вдоль магнитной полосы. Метки времени определяют блоки записи и заданный интервал времени Т для воспроизведения каждого из указанных блоков. Средство считывания, перемещаемое вручную, предназначено для считывания указанной записи и последовательности меток и формирования первого сигнала считывания записи и второго периодического сигнала считывания последовательности меток. Память предназначена для сохранения упорядоченной последовательности выборок указанного первого сигнала. На второй последующей стадии осуществляется считывание указанных сохраненных выборок в порядке, соотнесенном с порядком записи. Средство воспроизведения соединено с указанной памятью для приема указанных выборок сигнала и преобразования их в акустический и/или видеосигнал. Средство управления и синхронизации соединено со средством считывания для ...

ДИСКОВОД МАГНИТНОГО ДИСКА

Изобретение относится к дисководу магнитного диска, имеющему по меньшей мере одну с опирающейся на воздушный зазор поверхностью (ОВЗП) магнитную головку, с выполненными за одно целое считывающей и записывающей частями. Считывающая часть включает используемый в качестве первичного преобразователя спиновый клапан, чувствительный к действию магнитных полей и имеющий ОВЗП. Предложенная в изобретении конструкция дисковода магнитного диска имеет спиновый клапан с повышенной магниторезистивностью, простую конструкцию. 3 з.п. ф-лы, 14 ил.

НОСИТЕЛЬ ЗАПИСИ, ИМЕЮЩИЙ СТРУКТУРУ ДАННЫХ ДЛЯ УПРАВЛЕНИЯ, ПО КРАЙНЕЙ МЕРЕ, ОБЛАСТЬЮ ДАННЫХ НОСИТЕЛЯ ЗАПИСИ, И СПОСОБЫ И УСТРОЙСТВА ЗАПИСИ И ВОСПРОИЗВЕДЕНИЯ

Структура данных на носителе записи включает временную зону управления дефектами, в которой хранится блок данных. Блок данных включает информацию о записи и временную информацию о состоянии носителя записи. Информация о записи предоставляет информацию о зонах непрерывной записи в области данных носителя записи. Временная информация о состоянии носителя записи предоставляет информацию о состоянии носителя записи и содержит, по крайней мере, один указатель информации во временной зоне управления дефектами. Технический результат: оптимизация управления дефектами при помощи информации о состоянии носителя записи. 5 н. и 26 з.п. ф-лы, 6 ил.

Магнитная головка

Изобретение относится к магнитной головке для стирания данных. Магнитная головка содержит корпус, имеющий по существу плоскую внешнюю поверхность и содержащий удлиненный магнит, расположенный в нем. Удлиненный магнит имеет удлиненную по существу плоскую непрерывную верхнюю поверхность, а указанный корпус содержит множество отдельных намагничиваемых частей с возможностью намагничивания, связанных с магнитом, при этом указанное множество намагничиваемых частей выровнено относительно удлиненного магнита и образует по меньшей мере часть указанной по существу плоской внешней поверхности корпуса. Указанная удлиненная по существу плоская непрерывная верхняя поверхность удлиненного магнита проходит параллельно указанной по существу плоской внешней поверхности корпуса и под ней. Изобретение обеспечивает повышение надежности записи данных. 3 н. и 9 з.п. ф-лы, 6 ил.

ПОРТАТИВНЫЙ НОСИТЕЛЬ ДАННЫХ ДЛЯ РЕЗЕРВНОГО КОПИРОВАНИЯ И ПОСЛЕДУЮЩЕГО УДАЛЕНИЯ СОХРАНЕННОЙ ИНФОРМАЦИИ

Предложен портативный носитель данных с корпусом, несущим данные запоминающим устройством на основе полупроводниковых элементов, а также средство для резервного копирования и последующего надежного удаления сохраненной информации.

ТОНКОПЛЕНОЧНАЯ ЗАПИСЫВАЮЩАЯ ГОЛОВКА НИЗКОГО ПРОФИЛЯ, СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ И ПРИВОД МАГНИТНОГО НОСИТЕЛЯ

Изобретение относится к технике записи информации на магнитных носителях. Записывающая головка содержит детали первого и второго полюсов, магнитно соединенные в области наконечника полюса и в области заднего зазора. Область наконечника размещена между поверхностью головки и нулевой высотой щели. Головка имеет также область корпуса, расположенную между нулевой высотой щели и задним зазором. Набор изолирующих слоев помещен поверх детали первого полюса в области корпуса. Каждый из изолирующих слоев начинается из вершины и проходит от нее по направлению к заднему зазору. Набор обычно включает в себя первый, второй и третий изолирующие сдои. В предпочтительном варианте вершина второго изолирующего слоя размещена таким образом, что она определяет нулевую высоту щели головки. Это позволяет сформировать наконечник второго полюса с очень узкой шириной дорожки одновременно с формированием участка второго полюса, используя обычный процесс фотолитографической обработки, а также выполнять изолирующие ...

УСТРОЙСТВО СЧИТЫВАНИЯ КАРТ

Изобретение относится к устройству считывания карт. Технический результат – выполнение устройства с возможностью подачи карты в ее поперечном направлении, обеспечивает плавность перемещения затворного элемента даже в том случае, если в тракте подачи выполнено отверстие, обеспечивающее возможность прохождения через него магнитной головки. Устройство (1) считывания карт выполнено таким образом, что отверстие (13) для обеспечения возможности прохождения магнитной головки через него выполнено между позиционирующим элементом (50) и направляющей частью (29а), при этом расстояние (L) между контактной частью (50а) для карты в позиционирующем элементе (50) и внутренним концом направляющей части (29а) меньше, чем поперечный размер (W2) карты (2). Когда отверстие (13) закрыто затворным элементом (14), передний конец затворного элемента (14) располагается под направляющей частью (29а), и когда отверстие (13) не закрыто затворным элементом (14), затворный элемент (14) располагается под направляющей ...

Многослойная магнитная пленка с взаимодействием Дзялошинского-Мория и способ управления асимметричностью движения доменных границ в ней

Группа изобретений относится к области электроники. Многослойная магнитная пленка с взаимодействием Дзялошинского-Мория содержит подложку, на которой сформирована среда из немагнитного слоя с сильной спин-орбитальной связью и ферромагнитного слоя, при этом многослойная магнитная пленка типа «подложка/B/X1/Y/X2» с перпендикулярной магнитной анизотропией содержит полупроводниковую подложку из Si с ориентацией (111), буферный слой B из Cu толщиной 1-5 нм, немагнитный слой X1 из Pd толщиной 3-15 нм, который имеет среднеквадратичную шероховатость 0,25-0,8 нм и средний радиус островка 8,5-12,2 нм, ферромагнитный слой Y из Co толщиной 0,5-15 нм и немагнитный слой X2 из Pd толщиной 0,5-5 нм. Технический результат - повышение плотности записи информации, и скорости чтения/записи устройств хранения данных, и работы логических устройств на основе магнитных пленок. 2 н.п. ф-лы, 7 ил.

СПОСОБ ЗАПИСИ-СЧИТЫВАНИЯ ИНФОРМАЦИИ НА МАГНИТНОМ НОСИТЕЛЕ И ГОЛОВКА ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Использование: в устройствах записи-хранения-считывания информации, используемых в вычислительной технике, профессиональной и бытовой аудиовидеоаппаратуре, системах двустороннего кабельного телевидения с регенерацией видеоинформации. Сущность изобретения: способ состоит в осуществлении комбинированного физического воздействия на замкнутый тонкопленочный магнитопровод универсальной головки, находящейся в контакте с носителем по всей ширине последнего. Возникающий в результате локального термомагнитного обратимого нарушения магнитопроводности виртуальный зазор на узком рабочем участке магнитопровода позволяет с сильной концентрацией осуществлять запись-считывание информации способом обычной магнитной записи (воспроизведения). Оптоэлектронное позиционирование и сканирование виртуального зазора (развертка по строкам) производится без механического перемещения головки. Головка с переменным виртуальным зазором (ГПВЗ), изготавливаемая по интегральной планарной технологии, содержит помимо магнитопровода ...

АЛЮМИНИЕВО-БЕРИЛЛИЕВЫЕ СПЛАВЫ, ОБРАБОТАННЫЕ В ПОЛУТВЕРДОМ СОСТОЯНИИ

Изобретение относится к получению, обработке и производству изделий из алюминиевых сплавов с добавками бериллия. В изобретении описана обработка в полутвердом состоянии промышленного алюминиевого сплава и прессованного порошкового бериллия, гарантирующая изделия, свободные от бериллидов. Настоящий способ исключает перемешивание жидких сплавов и необходимость применения складывающих сил, благодаря использованию распыленных или измельченных частиц бериллия в смеси с твердыми частицами или жидким алюминием. Размер и форма фазы бериллия (сферическая и недендритная), невзирая на дополнительную обработку, остается без изменения. 5 с. и 20 з.п. ф-лы, 5 ил, 3 табл.

Умножитель частоты на тонкой магнитной пленке

Изобретение относится к технике сверхвысоких частот и предназначено для умножения частоты СВЧ сигналов в системах связи, радиолокации, радионавигации, различной измерительной и специальной радиоаппаратуре. Техническим результатом изобретения является повышение коэффициента преобразования устройства при сохранении радиационной стойкости. Умножитель частоты на тонкой магнитной пленке содержит заземленный с одного края нерегулярный четвертьволновый резонатор. Размеры проводников резонатора подобраны таким образом, что резонансная частота его второй моды колебаний ровно в два раза превышает резонансную частоту первой моды колебаний, а резонансная частота третьей моды не кратна резонансной частоте первой моды колебаний. Тонкая магнитная пленка помещается между полосковыми проводниками резонатора и заземленным основанием вблизи короткозамкнутой части резонатора. 4 ил.

УСТРОЙСТВО ДЛЯ ПРОВЕРКИ МАГНИТНОГО РЕЛЬЕФА МАТЕРИАЛОВ НОСИТЕЛЕЙ ИНФОРМАЦИИ

Группа изобретений относится к технике контроля магнитного рельефа магнитных материалов. Устройство для проверки магнитного рельефа материалов магнитных носителей информации содержит полеобразующую систему, источник питания, импульсный генератор, первый и второй электронный ключ, устройство регистрации параметров магнитного поля, амплитудный селектор, микроконтроллер, соленоид, матрицу из мультиферроидных материалов. Технический результат – повышение качества проверки наличия или отсутствия информации на магнитном носителе. 2 н. и 12 з.п. ф-лы, 8 ил.

СПОСОБ И УСТРОЙСТВО ДЛЯ СОХРАНЕНИЯ ПОТОКА ДАННЫХ, ПРИНИМАЕМЫХ ОТ ИСТОЧНИКА

... 1. Способ сохранения потока данных, принимаемых от источника, в памяти, при этом поток данных содержит поток аудиовизуальных данных и других данных, причем способ содержит этапы (a) сохранения потока данных в памяти, и (b) приема команды паузы, отличающийся тем, что дополнительно содержит этапы (c) приостановки сохранения потока аудиовизуальных данных при приеме команды паузы, и (d) продолжения сохранения упомянутых других данных. 2. Способ по п.1, отличающийся тем, что другие данные мультиплексированы с потоком аудиовизуальных данных и способ дополнительно содержит этап анализа потока данных. 3. Способ по п.2, отличающийся тем, что данные в потоке разделены на поток аудиовизуальных данных и других данных и в памяти аудиовизуальные данные сохраняются отдельно от других данных. 4. Способ по п.1, отличающийся тем, что другие данные содержат интерактивные приложения, которые используют точки запуска в потоке аудиовизуальных данных в качестве входных данных, и тем, что дополнительно содержит ...

НОСИТЕЛЬ ЗАПИСИ, ИМЕЮЩИЙ СТРУКТУРУ ДАННЫХ ДЛЯ УПРАВЛЕНИЯ, ПО КРАЙНЕЙ МЕРЕ, ОБЛАСТЬЮ ДАННЫХ НОСИТЕЛЯЗАПИСИ, И СПОСОБЫ И УСТРОЙСТВА ЗАПИСИ И ВОСПРОИЗВЕДЕНИЯ

... 1. Носитель записи, имеющий структуру данных для управления областью данных носителя записи, содержащий временную зону управления дефектами, в которой хранится первый блок данных, причем первый блок данных включает в себя информацию о последовательной записи и временную структуру определения, информация о последовательной записи предоставляет информацию о зонах непрерывной записи в области данных носителя записи, а временная структура определения содержит, как минимум, один указатель информации во временной зоне управления дефектами. 2. Носитель записи по п.1, в котором первый блок данных имеет размер, как минимум, один кластер. 3. Носитель записи по п.2, в котором один сектор первого блока данных отдано временной структуре определения, и не больше чем 31 сектор первого блока данных отданы информации о последовательной записи. 4. Носитель записи по п.3, в котором первый сектор информации о последовательной записи расположен рядом с временной структурой определения. 5. Носитель записи по ...

НАКОПИТЕЛЬ ИНФОРМАЦИИ НА ЖЕСТКОМ МАГНИТНОМ ДИСКЕ

Накопитель информации на жестком магнитном диске, который содержит жесткий магнитный диск, позиционирующее устройство, головки чтения-записи, отличающийся тем, что содержит два или более независимых друг от друга позиционирующих устройства.

СИСТЕМА НА ОПТИЧЕСКИХ ДИСКАХ

... 1. Способ перемещения блока каретки из начального положения в конечное положение относительно носителя информации, характеризуемого центром и окружностью и вращающегося относительно упомянутого блока каретки с окружной скоростью вокруг упомянутого центра, отличающийся тем, что включает в себя следующие операции: определение первого радиального расстояния между упомянутым начальным положением упомянутого блока каретки и упомянутым центром упомянутого носителя информации; определение второго радиального расстояния между упомянутым конечным положением упомянутого блока каретки и упомянутым центром упомянутого носителя информации; определение расстояния по окружности между упомянутым начальным положением упомянутого блока каретки и упомянутым конечным положением упомянутого блока каретки параллельно упомянутой окружности упомянутого носителя информации; определение начальной окружной скорости упомянутого носителя информации вокруг упомянутого центра упомянутого носителя; определение траектории ...

УСТРОЙСТВО ДЛЯ НАНЕСЕНИЯ ПО МЕНЬШЕЙ МЕРЕ ОДНОГО НАМАГНИЧИВАЕМОГО СЛОЯ НА ГИБКИЙ НЕМАГНИТНЫЙ НОСИТЕЛЬ

Объектом изобретения является устройство для нанесения по меньшей мере одного намагничиваемого слоя на гибкий немагнитный носитель, содержащее корпус по меньшей мере с одной разливной щелью, входящей в выпускное отверстие, и выполненный в виде прямоугольного параллелепипеда магнит, размещенный на отвернутой от корпуса стороне носителя параллельно последнему, причем верхняя в положении эксплуатации кромка выпускного отверстия сдвинута назад по сравнению с нижней кромкой, и верхняя кромка магнита размещена напротив выпускного отверстия, отличительная особенность которого заключается в том, что по обеим сторонам выпускного отверстия в основном вертикально ему установлена по одной снимающей плите, в направлении носителя удлиненной за верхнюю и нижнюю кромки выпускного отверстия.

Магнитомодуляционная головка

Изобретение относится к технике магнитной записи и позволяет повысить эффективность воспроизведения с одновременным уменьшением габаритов. Размещенный внутри корпуса 1 вибратор 5 головки выполнен в виде прямоугольного пьезоэлектрического элемента, двумя сторонами жестко соединенного с полусердечниками 2 в области дополнительного зазора. Две другие стороны его через резиновые прокладки сопряжены с корпусом 1. Под действием возбужденных в вибраторе 5 продольных механических колебаний будет изменяться дополнительный зазор 4 и соответственно магнитное сопротивление магнитопровода головки. Амплитуда переменной ЭДС, наведенной в катушках i 8, пропорциональна величине измеряемого потока. 2 ил. (Л ю О) i4 h сл г ие. f ...

Способ воспроизведения информации с магнитного носителя

Изобретение относится к области магнитной записи и позволяет расширить частотный и динамические диапазоны воспроизведении информации с магнитного носителя . Устройство, осуществляющее способ. содержит индукционную магнитную головку 1 с обмоткой 2, преобразователь 3 ток короткого замыкания-напряжение, инвертор 4, резистор 5 и выходные шины 6 воспроизведенной информации. Вследствие компенсации магнитного потока в магнитном сердечнике индукционной магнитной головки 1 устраняются потери, обусловленные материалом магнитного сердечника, что расширяет частотный диапазон воспроизводимой информации. Введение новых связей между элементами устройства позволяет формировать сигнал, пропорциональный намагниченности магнитного носителя, и повышает отношение результата воспроизведения к помехе . Изобретение является дополнительным к авт. св. № 1150644. 1 ил. с ND ЬО СО ел ...

Блок тонкопленочных магнитных головок

Комбинированный блок магнитных головок

Изобретение относится к приборостроению . Цель изобретения - уменьшение влияния маги, головки записи на головку воспроизведения. Для этого плоскости стыка 5, 14 близлежащих полюсных и ответных частей головок записи и воспроизведения расположены под углом а 130-140° к боковым граням ответных частей сердечников 7, 16. Выполнение ширины зазора стыка головки 1 записи, в 1,5-3 раза превышаю- шей ширину зазора стыка головки 11 воспроизведения , а также размещение вершин тупых углов, образованных пересечением боковых граней ответных частей сердечников 7 и 16 с соответствуюшими плоскостями стыка 5 и 14, на одной линии, перпендикулярной плоскости рабочих зазоров магн. головок , позволяет благодаря узкой направленности зоны рассеяния и зоны чувствительности разнести магн. головки 1 и 11 в пространстве и тем самым уменьшить влияние головки 1 записи на головку 11 воспроизведения в комбинированном блоке. 2 ил. Sg С/ с 12 Г5 42 к с а о: // ...

Блок магнитных головок

БЛОК МАГНИТНЫХ ГОЛОЮК, I содержаЬщй выполненные из пластмас;сы две скрепленные через немагнитную .прокладку корытообразные обоймы, в пазах которых установлены магнитомягкие полусердечники с обмотками, о тли ч ающий с я тем что, с целью повышения механической прочности блока и снятия статического электричества с полусердечников магнитных головок, в основаниях обойм вьшолнены Т-образные полости, в которых установлены немагнитные пластины с выступами,в частях пластин с длиной,равной ширине обоймы,выполнены отверстия с резьбой в отверстиях одной из пластин, а выступы сопряжены с боковыми стенками обойм со стороны заднего дополнительного зазора и имеют контакт с соот (П ветствз/ющими полусердечниками. 4 ...

Связующее вещество рабочего слоя носителя магнитной записи

Способ контроля качества материала для сердечников магнитных головок

Диск видеоголовок

... д«ек видасй-оловок, содар-Г видеоголовю взаимодействующие о ют кк:тн|«сшоЧ1Н е aneiwHl и регуашео81вчн1аеУвия«;, , «;;«--;tPia i- 5fcii: С ,«в|№« обеепе йнтя Ни «|1яеш сМк $ ро. ерем : «c)G«)t «i«tai« ; ietcae: .-: о м0щл1е Tjto, .)-, . «ШИ1ФМ; -В -««ШЕ О€) ) .; fnix: :взр®«згч в/;- й1ри«ем -асварйКй. секто - «9CisJu«B{t .. да $Ш-;«« ие «пЁкаамк с B03MOKi peitrbi лИЙ РЙв@ в1 в;9Ой9 ; . . эткх;. я«йг « «инс: |фй :- з«ю«1 д| пг нм;с peryji iiK o4ficM вйнтшш.

Способ получения игольчатой гамма-окиси железа для носителей магнитной записи

Изобретение относится к получению игольчатой гамма-окиси железа для носителей магнитной записи. Цель - снижение копирэффекта носителей магнитной записи путем получения агрегированных в пакеты игольчатых частиц порошка окиси железа размером 2-4 мкм. Игольчатые частицы получают из водных растворов солей двухвалентного железа и щелочи. Окисление гидрозакиси железа ведут атмосферным воздухом при перемешивании суспензии по ее свободной поверхности. При этом отношение высоты слоя суспензии к ее поперечному сечению 1,2-2,0, число Рейнольдса 3000-60000, а время окисления 4-8 ч. Получены пакетированные частицы игольчатой гамма-железа (2-4 мкм), позволяющие получить носители магнитной записи с низким (минус 57,0-минус 58,5) значением копирэффекта. 1 табл.

Магнитная головка

Изобретение относится к технике магнитной записи, а именно к магнитным головкам. Целью изобретения является повышение эффективности магнитной головки. Магнитная головка содержит два полусердечника различного поперечного сечения. Полусердечник меньшего сечения выполнен составным с массивной основной частью и пленочным полюсным наконечником, которые сопряжены между собой по наклонной плоскости под тупым углом к рабочей поверхности с пересечением части зазора с немагнитным материалом. 1 п.ф., 1 ил.

Способ термомагнитной записи-воспроизведения

Изобретение относится к накоплению информации и может быть использовано для термомагнитной записи - воспроизведения. Цель изобретения - повышение плотности записи без уменьшения достоверности воспроизведения. В процессе записи предварительно намагничивают носитель магнитной записи, а затем воздействуют на него лазерным лучом, который предварительно изменяют записываемым сигналом. В процессе воспроизведения нагревают носитель магнитной записи лазерным лучом до температуры выше температуры Кюри, а формирование воспроизведенного сигнала осуществляют по изменению магнитного поля в процессе размагничивания носителя записи воздействием лазерного луча.

Способ определения уровня стирания магнитной записи

Изобретение относится к накоплению информации. Цель изобретения - повышение точности определения уровня стирания магн. записи за счет уменьшения влияния шумов. Токи стирания изменяют до таких значений, при которых отношение напряже- няя воспроизведенного контрольного сигнала к каждому из воспроизведенных после стирания остаточных напряжений не менее, чем на порядок, выше напряжения шумов. Отношение напряжения воспроизведенного контрольного сигнала к напряжению, определяемому математическим выражением, характеризует уровень стирания магн. записи для заданного тока стирания. I ил. с $ ...

Устройство для допускового контроля чувствительности пьезопреобразователя головки воспроизведения системы автотрекинга

Изобретение относится к приборостроению и может быть использовано при измерении параметров головок воспроизведения системы автотрекинга для видеомагнитофонов с наклонно-строчной записью. Изобретение позволяет повысить производительность контроля при одновременном конструктивном упрощении устройства. Пилообразный сигнал с выхода цифроаналогового преобразователя 10 поступает через усилитель 11 на соединенные входы двухпорогового компаратора 12 и высоковольтного усилителя 2, который формирует управляющий сигнал, подаваемый на пьезопреобразователь головки 3 воспроизведения. Под воздействием этого сигнала пьезопреобразователь отклоняется от своего первоначального состояния и перемещается в сторону датчика 5 положения пьезопреобразователя. При вхождении пьезопреобразователя в зону срабатывания датчика 5 на его выходе появляется постепенное напряжение, которое поступает на вход компаратора 6, вызывая его срабатывание. Сигнал с выхода компаратора 6 поступает на блокирующий вход генератора линейно ...

Устройство для калибровки индикатора уровня записи магнитофона

Устройство для изготовления носителя магнитной записи

Способ получения ферромагнитной двуокиси хрома

Устройство для воспроизведения с носителя записи

Движущий механизм для магнитных дисков

Устройство для воспроизведения цифровых данных с носителя магнитной записи

УСТРОЙСТВО ДЛЯ ВОСПРОИЗ; ВЕДЕНИЯ ЦИФРОВЫХ ДАННЫХ С НОСИТЕЛЯ МАГНИТНОЙ ЗАПИСИ, содержащее воспроизводящую магнитную головку, выполненную с магниторезистивньгми- тонкопленочными элементами, первые выводы которых подсоединены к шине питания , а вторые выводы - к входам дифференциального усилителя, резисторы, конденсатор и общую шину, отличающееся тем, что, с целью повышения чувствительности и уменьшения теплорассеяния, в него введе- ны гираторы, выпблненные на операционных усилителях, первые входы которых подсоединены к вторым выводам магниторезистивных тонкопленочных элементов, а выходы соединены через резисторы с входами дифференциального усилит.еля, выполненного i в виде биполярного операционного усилителя, причем вторые входы опеСО рационных усилителей гираторов подключены к общей шине, а управляклцие входы соединены непосредственно с разными выводами конденсатора. ел со со ...

Устройство для перемещения магнитной головки

Магнитная головка записи и воспроизведения

Устройство для перемещения магнитных головок

VORRICHTUNG ZUR MAGNETISCHEN DATENSPEICHERUNG

Positionier-/Rückzugsvorrichtung für einen Lese- und/oder Schreibkopf

Biaxial orientierter Mehrschichtfilm aus Polyester

Verbesserter magnetoresistiver Lese-/Schreibkopf (MR)

Magnetowiderstandseffektvorrichtung und hiermit versehener Magnetkopf, Speicher- und Verstärkungsanordnung

Lesevorrichtung und -system

Magnetisches Speichergerät

Magnetkopfvorrichtung und Verfahren zu dessen Herstellung

Magnetische, spindelförmige Legierungsteilchen mit Kobalt und Eisen als Hauptbestandteilen sowie Verfahren zu deren Herstellung

Magnetische, spindelförmige Legierungsteilchen mit Kobalt und Eisen als Hauptbestandteilen sowie Verfahren zu deren Herstellung

VIDEOSIGNAL-WIEDERGABEGERAET MIT AUFNAHMEWIEDERHOLUNGSFUNKTION UND ZUGEHOERIGES VERFAHREN

VERFAHREN ZUR PRUEFUNG DER LAGE EINES MAGNETKOPFES BEZUEGLICH EINES MAGNETISCHEN SIGNALTRAEGERS UND MESSIGNALTRAEGERS ZUR DURCHFUEHRUNG DES VERFAHRENS

MAGNETISCHE EISENOXIDE MIT VERBESSERTER AUSRICHTBARKEIT UND VERFAHREN ZU IHRER HERSTELLUNG

MAGNETKOPF

VERFAHREN ZUR HERSTELLUNG VON GAMMA-EISEN(III)-OXID

Film für magnetische Senkrechtaufzeichnung, mehrschichtiger Film geeignet für die Konversion zum Film für magnetische Senkrechtaufzeichnung, und Verfahren zur Herstellung vom Film für magnetische Senkrechtaufzeichnung aus diesem mehrsichtigen Film.

Datenspeichergerät.

Gerät- und Aufzeichnungsmethode für digitalen Daten

Magnetisches Aufzeichnungsband aus biaxial gerecktem Polyethylen-2,6-naphtalindicarboxylat Film

Beschichtungsvorrichtung und Verfahren zum Auftragen eines Überzugmediums auf einen ununterbrochen laufenden flexiblen Träger

Beschichtungsvorrichtung zum Auftragen eines Überzugsmediums auf einen ununterbrochen laufenden flexiblen Träger (W) mit: einem Rückkantenabschnitt (6) mit einer Rückkantenfläche (6a), einem Abstreifrandabschnitt (5) mit einer Abstreifrandfläche (5a), der in einer Laufrichtung des Trägers (W) dem Rückkantenabschnitt (6) nachfolgend angeordnet ist, einem Spalt (4), der zwischen der Rückkantenfläche (6a) und der Abstreifrandfläche (5a) ausgebildet ist, zum Auftragen des Überzugsmediums auf eine Oberfläche des Trägers (W), der ununterbrochen sowohl über die Rückkantenfläche (6a) als auch über die Abstreifrandfläche (5a) hinweg läuft, wobei eine fiktive Ebene durch ein Ende (B) der Rückkantenfläche (6a) an dem Spalt (4) und einem bezüglich der Laufrichtung des Trägers (W) nachfolgend liegenden Ende (A) der Abstreifrandfläche (5a) definiert ist, einem Winkel θ1, der von einer Tangente an dem Ende (B) der Rückkantenfläche (6a) und der fiktiven Ebene eingeschlossen ist, einem Winkel θ2, der von ...

VERFAHREN ZUR BEARBEITUNG EINES SIGNALDRAHTES

Kamera, geeignet für photographische Filme, die bestückt sind mit magnetischen Speicherabschnitten

Dünnfilm-Magnetkopf und seine Verwendung

MAGNETPLATTENVORRICHTUNG

Verfahren zur Oberflächentexturierung von sprödem Material

MAGNETKOPF UND MAGNETKOPFVORRICHTUNG

Analogue=digital voltage converter - uses binary values representing results of successive comparisons with respective reference voltages

The A/D converter allows an analogue voltage to be converted into a corresponding digital value by comparison with a number of different reference values (Uc1...Urn). A binary value is provided in dependence on the result of each comparison, each held by a respective bistable memory element (F1...Fn) with resetting of the latter to an initial condition at the beginning of each conversion. The binary values are stored by the memory elements (F1...Fn) in response to a window signal.

VERFAHREN ZUR HERSTELLUNG VON MEHRSCHICHTMAGNETOGRAMMTRAEGERN

DIGITALES SERVOSPURFOMAT

ZUSAMMENGESETZTER METALL- UND FERRITWANDLERKOPF UND HERSTELLUNGSVERFAHREN DAFÜR

MAGNETKOPFANORDNUNG, DESSEN HERSTELLUNG UND MAGNETPLATTENGERÄT

VERFAHREN ZUR HERSTELLUNG VON MAGNETISCHEN EISENOXIDEN UND SO ERHALTENE PIGMENTE

Magnetowiderstandseffekt-Magnetkopf und zusammengesetzter Magnetkopf

Magnetaufzeichnungsmedium

MAGNETPLATTENGERÄT UND SEIN HERSTELLUNGSVERFAHREN

Audio tape cassette contg. magnetic tape - with coating of pigment and binder on rear face with specified max. coefft. of friction against felt cushion

Cassette (I) comprises (A) cassette housing (B) pair of hubs arranged so they rotate in (A) (C) magnetic tape which is wound around (B) with magnetic layer turned outwards, (D) guide part in (A) and guiding running of (C) (E) felt cushion between (B) and contacting rear face of (C) to press (C) against a magnetic head, (C) having coating (II) on rear face comprising a pigment and binder and having coefft. of friction against (E) of not more than 0.4. Pref. (A) is of synthetic resin esp. ethylene-propylene copolymer or phenolic resin, or composite of ethylene-propylene copolymer and CaCO3 and opt ZnO or of phenolic resin and glass fibres. (E) is of Angora rabbit hair. (II) has max. pencil hardness of 5H. (II) has max. ave. thickness along middle line of 0.03 micron. Pigment in (II) has max. hardness on Moh scale of 4, pigment in (II) is CaCO3. Binder in (II) is resin having max coeffct. of friction against (E) of 0.4 when (II) is formed only from this resin. Resin in (II) is vinyl chloride-vinyl ...

Plattengerät und Verfahren zur Verminderung von Beschädigungen durch Schlageinwirkung

Gleitkörper mit Kompositlötstellen und Verfahren zu dessen Herstellung

Magnetisches Doppeldeck Aufnahme-/Wiedergabegerät

Gerät zur magnetischen Aufzeichnung und Wiedergabe mit mehreren Verbund-Magnetköpfen und Verfahren zur Herstellung eines bei diesem Gerät verwendbaren Verbund-Magnetkopfes

Dualer magnetoresistiver Wiedergabekopf mit magnetischer Abschirmung und Verfahren zu seiner Herstellung

Verfahren zur Optimierung eines Schreibstromes für mindestens einen drehbaren Magnetkopf und Anordnung zur Ausführung eines derartigen Verfahrens

SCHALTUNGSANORDNUNG ZUM SELEKTIVEN DURCHSCHALTEN VON LESESIGNALEN EINES MEHRFACHMAGNETKOPFES BEI EINEM MAGNETSCHICHTSPEICHER

Magnetwiderstands-Sensor mit selbstpolarisiertem Mehrschichtsystem

Cutting continuous magnetic tape - using pair of rotary blades above and below tape, which are offset slightly to avoid burred edge

Cutting continuous magnetic tape, having a magnetic coating on a nonmagnetic substrate, is carried out from the front and back of the tape with a pair of rotary blades. The axis of rotation of the blades is parallel to the surface of the tape and in the direction of the tape width and the blades have a radial overlap. The novelty is that the gap between the cutting edges of the blades in the tape width direction is 3-20% of the thickness of the tape. Pref. at least one of the blades has a bevelled cutting edge. The bevel pref. is such that the bevel height along the tape thickness direction at the surface is 1.4 to 100 times the tape thickness and the bevel width along the tape width direction at the side is 1/40 to 18 times the tape thickness. ADVANTAGE - The technique avoids forming burrs along the edge of the tape and soiling the tape running system or peripheral equipment used in the tape mfg. process.

Festplatte

Magnetlegierung und seiner Herstellungsverfahren

HEXAFERRIT MATERIALE

FLEXIBLE SCHALTUNG MIT EINEM SCHWINGUNGSSENSOR UND VERFAHREN UND GERÄT MIT EINER SOLCHEN FLEXIBLEN SCHALTUNG

Wiedergabe von Stehbilddaten

Magnetkopf mit verbessertem Abschirmglied

ANORDNUNG MIT MAGNETSCHREIBKOPF SOWIE SCHREIBVERSTÄRKER MIT KAPAZITIVER STROMKOMPENSATION

VIDEOWIEDERGABEGERAET

Ringfoermiger Magnetkopf und Verfahren zum Herstellen eines ringfoermigen Magnetkopfes

Dünnfilm-Magnetkopf mit schmaler Spurbreite und dessen Herstellungsverfahren

Datenrückgewinnungsverfahren für eine Magnetplatten-Datenspeichereinrichtung

Wandler mit verbesserter induktiver Kopplung

Laminierter Polyesterfilm für magnetisches Aufzeichnungsmedium

DUENNFILM-MAGNETKOPF MIT EINER FLACHEN SCHREIB-/LESEPULENWICKLUNG

A thin-film magnetic head composed of layers contains a conductor which conducts the magnetic flux. The conductor comprises two magnetic arms with end pieces which form successive magnetic poles and delimit a space beyond the region of these end pieces through which a flat, single- or multi-layered write/read wire-wound coil extends. To ensure minimal losses from the coil, in the apical region (S) of the coil (17) facing the end pieces (10, 11) the width (Ba to Bi) of the conducting track (18) from other external coils (17a to 17i) is greater that than from similar internal coils (17j to 17p).

Process for production of magnetic thin film, magnetic thin film, and magnetic material

The present invention provides a process for production of a magnetic thin film which has insulation properties, serves as a permanent magnet, and has improved residual magnetization in comparison with prior arts, the magnetic thin film, and a magnetic material. When a magnetic thin film 3 is formed, an external magnetic field with a predetermined intensity is applied to a coating liquid containing magnetic particles containing epsilon-type iron-oxide-based compounds which have insulation properties and which serve as a permanent magnet, and the coating liquid is let cured in order to form the magnetic thin film 3 . Accordingly, the magnetic particles containing the epsilon-type iron-oxide-based compounds can be fixed while being oriented regularly in a magnetization direction. This realizes the process for production of the magnetic thin film 3 which has insulation properties and which serve as a permanent magnet, the magnetic thin film 3 , and a magnetic material 1.

Glass substrate for magnetic recording medium and magnetic recording medium

An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass comprising, denoted as molar percentages, 56 to 75 percent of SiO 2 , 1 to 11 percent of Al 2 O 3 , more than 0 percent but equal to or less than 4 percent of Li 2 O, equal to or more than 1 percent but less than 15 percent of Na 2 O, equal to or more than 0 percent but less than 3 percent of K 2 O, and substantially no BaO, with a total content of Li 2 O, Na 2 O, and K 2 O falling within a range of 6 to 15 percent, with a molar ratio (Li 2 O/Na 2 O) being less than 0.50, with a molar ratio {K 2 O/(Li 2 O+Na 2 O+K 2 O)} being equal to or less than 0.13, with a total content of MgO, CaO, and SrO falling within a range of 10 to 30 percent, with a total content of MgO and CaO falling within a range of 10 to 30 percent, with a molar ratio {(MgO+CaO)/(MgO+CaO+SrO)} being equal to or more than 0.86, with a total content of the above alkali metal oxides and alkaline earth metal oxides falling within a range of 20 to 40 percent, with a molar ratio {(MgO+CaO+Li 2 O)/(Li 2 O+Na 2 O+K 2 O+MgO+CaO+SrO)} being equal to or more than 0.50, with a total content of ZrO 2 , TiO 2 , Y 2 O 3 , La 2 O 3 , Gd 2 O 3 , Nb 2 O 5 , and Ta 2 O 5 being more than 0 percent but equal to or less than 10 percent, and with a molar ratio {(ZrO 2 +TiO 2 +Y 2 O 3 +La 2 O 3 +Gd 2 O 3 +Nb 2 O 5 +Ta 2 O 5 )/Al 2 O 3 } being equal to or more than 0.40, as well as having a glass transition temperature of equal to or higher than 600° C., an average coefficient of linear expansion of equal to or higher than 70×10 −7 /° C. at 100 to 300° C., and a Young's modulus of equal to or higher than 80 GPa.

Magneto-Elastic Anisotropy Assisted Thin Film Structure

A method includes activating a stress-effecting layer of a thin film structure, having the stress effecting layer adjacent to a magnetic layer, to induce a magneto-elastic anisotropy in the magnetic layer.

Magnetic recording medium

An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder is comprised of magnetic particles comprising a hard magnetic particle and a soft magnetic material deposited on a surface of the hard magnetic particle in a state where the soft magnetic material is exchange-coupled with the hard magnetic particle.

Method of Forming a PMR Writer Device with Multi-Level Tapered Write Pole

A perpendicular magnetic recording (PMR) head is fabricated with a multi-level tapered write pole which creates an efficient channeling of magnetic flux to the pole tip. The write pole comprises a main pole with a tapered tip on which is formed at least one yoke that has a tapered edge. The edge of the yoke is recessed from the ABS of the tapered tip, giving the write pole a stepped profile. The tapered tip can be two sloped surfaces that are symmetric about a mid plane of the main pole or a single sloped edge on the leading side or the trailing side of the pole. The yoke structure can consist of a single yoke formed on one side of the main pole or it can consist of two yokes formed symmetrically on both the leading and trailing sides of the main pole.

MANUFACTURING METHOD OF A GLASS SUBSTRATE FOR A MAGNETIC DISK

An object of the invention is to effectively remove particles on the glass substrate surfaces, even in the case wherein abrasive particles having a small particle size is used in the polishing step of the glass substrate and a supersonic treatment is performed at a high frequency at the supersonic cleaning step after the polishing step. In a manufacturing method of a glass substrate for a magnetic disk comprising a polishing step for performing polishing of the glass substrate and a supersonic cleaning step for performing supersonic cleaning of the glass substrate after the polishing step, the polishing step uses abrasive particles having a particle size of 10 nm to 30 nm and a first supersonic cleaning is performed at a frequency of 300 kHz to 1,000 kHz to form secondary particles and then a second supersonic cleaning is performed at a frequency of 30 kHz to 100 kHz in the supersonic cleaning step. 1. A manufacturing method of a glass substrate for a magnetic disk wherein the process comprises a polishing step for performing polishing of the glass substrate with abrasive particles having a specified particle size and a supersonic cleaning step for performing supersonic cleaning of the glass substrate after the polishing step and that the supersonic cleaning step comprises performing a first supersonic cleaning at a frequency to aggregate particles having the specified particle size to form secondary particles and then performing a second supersonic cleaning at a frequency to clean the secondary particles as the cleaning target.2. The manufacturing method of a glass substrate for a magnetic disk according to claim 1 , wherein the polishing step uses abrasive particles having a particle size of 10 nm to 30 nm and a first supersonic cleaning is performed at a frequency of 300 kHz to 1 claim 1 ,000 kHz to form secondary particles and then a second supersonic cleaning is performed at a frequency of 30 kHz to 100 kHz in the supersonic cleaning step.3. The manufacturing ...

Method of modifying surface of powder, coating material, method of manufacturing magnetic recording medium, and magnetic recording medium manufactured by the same

An aspect of the present invention relates to a method of modifying a surface of a powder, comprising mixing a powder with a compound denoted by general formula (I): wherein, in general formula (I), each of R 10 and R 13 independently denotes a hydrogen atom, alkyl group, or aryl group, each of R 11 and R 12 independently denotes an alkyl group or an aryl group, and L denotes a single bond or an oxygen atom.

Magnetic particles and method of manufacturing the same, and usage thereof

An aspect of the present invention relates to a method of manufacturing magnetic particles, which comprises adding a carboxylic acid compound to a water-based magnetic liquid, wherein the water-based magnetic liquid comprises magnetic particles dispersed in an acidic water-based solvent, and the carboxylic acid compound is selected from the group consisting of aromatic compounds and aliphatic compounds having one or more carboxylic acid (salt) groups denoted by: —COOM wherein M denotes a hydrogen atom or an alkali metal atom, when the number of the carboxylic acid (salt) group contained within the molecule thereof is 1, the number of carbon atoms, excluding the carboxylic acid (salt) group portion, ranges from 1 to 13; and then collecting the magnetic particles from the water-based magnetic liquid to obtain the magnetic particles the surfaces of which have been modified by being coated with the carboxylic acid compound.

MAGNETIC PARTICLES AND METHOD OF MANUFACTURING THE SAME, AND USAGE THEREOF

An aspect of the present invention relates to a method of manufacturing magnetic particles, which comprises: adding a compound to a water-based magnetic liquid, wherein the water-based magnetic liquid comprises magnetic particles dispersed in an acidic water-based solvent, and the compound is selected from the group consisting of amine compounds, aromatic compounds, and aliphatic compounds having one or more monovalent phosphorus polar groups denoted by: 2. The method of manufacturing magnetic particles according to claim 1 , wherein the compound comprises one or more phosphonic acid (salt) groups as the monovalent phosphorus polar group.7. The method of manufacturing magnetic particles according to claim 1 , wherein the compound comprises two or more of the monovalent phosphorus polar groups.8. The method of manufacturing magnetic particles according to claim 7 , wherein the compound is an amine compound comprising two or more of the monovalent phosphorus polar groups.9. The method of manufacturing magnetic particles according to claim 1 , wherein the compound further comprises one or more carboxylic acid (salt) groups.10. The method of manufacturing magnetic particles according to claim 1 , wherein the compound is selected from the group consisting of phenylphosphonic acid claim 1 , ethyelendiamine tetrakismethylenephosphonic acid claim 1 , glycine-N claim 1 ,N-bis(methylenephosphonic acid) claim 1 , nitrilotris(methylenephosphonic acid) claim 1 , and octadecylphosphonic acid.11. The method of manufacturing magnetic particles according to claim 1 , wherein the magnetic particles are hexagonal ferrite magnetic particles.12. The method of manufacturing magnetic particles according to claim 3 , wherein the magnetic particles are hexagonal ferrite magnetic particles.13. The method of manufacturing magnetic particles according to claim 5 , wherein the magnetic particles are hexagonal ferrite magnetic particles.14. Magnetic particles manufactured by the manufacturing ...

MAGNETIC RECORDING MEDIUM, METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING OR REPRODUCING APPARATUS

Ion irradiation is applied to the surface of a recording layer which has a granular structure containing ferromagnetic particles which are composed of an L10 ordered alloy and a non-magnetic intergranular layer, thereby the ferromagnetic particles in the side of the substrate are transformed into an L10 ordered alloy having a high magnetic anisotropy, and the ferromagnetic particles in the side of the surface of the medium are transformed into an A1 disordered alloy having a low magnetic anisotropy. 1. A magnetic recording medium having at least a soft magnetic under layer , a non-magnetic seed layer , a magnetic recording layer , and a protection layer on a substrate wherein the magnetic recording layer has a granular structure formed of ferromagnetic crystalline particles and a non-magnetic intergranular layer , the ferromagnetic crystalline particles are composed of an ordered alloy having an L10 crystalline structure at the side close to the substrate and a disordered alloy having an Al crystalline. structure at the side close to the surface in the direction of thickness of the magnetic recording layer.2. The magnetic recording medium according to wherein the ferromagnetic crystalline particles are composed of at least one element of Fe and Co and at least one element of Pt and Pd as a main component.3. The magnetic recording medium according to wherein the magnetic: recording layer has at least one element selected from B claim 2 , N claim 2 , Ar claim 2 , Cr claim 2 , Nb claim 2 , and Ga claim 2 , and the concentration of the element is higher at the side close the surface and lower at the side close to the substrate.4. The magnetic recording medium according to claim 1 , wherein the magnetic recording layer is separated by at least one non-magnetic layer.5. A method for manufacturing the magnetic recording medium which includes forming a disordered alloy having an A1 crystalline structure by ion irradiation.6. The method for manufacturing the magnetic ...

MAGNETO-RESISTANCE EFFECT ELEMENT, MAGNETIC HEAD ASSEMBLY, MAGNETIC RECORDING AND REPRODUCING APPARATUS, AND MAGNETIC MEMORY

According to one embodiment, a magneto-resistance effect element includes: a first electrode; a second electrode; a first magnetic layer provided between the first and the second electrodes; a second magnetic layer provided between the first magnetic layer and the second electrode; and an oxide layer of a metal oxide provided between the first magnetic layer and the second magnetic layer. The oxide layer includes wustite crystal grains of a wustite structure with a (1 1 1) plane orientation containing iron. A lattice spacing of a (1 1 1) plane of the wustite crystal grains is not less than 0.253 nanometers and not more than 0.275 nanometers. 1. A magneto-resistance effect element comprising:a first electrode;a second electrode;a first magnetic layer provided between the first electrode and the second electrode;a second magnetic layer provided between the first magnetic layer and the second electrode; andan oxide layer of a metal oxide provided between the first magnetic layer and the second magnetic layer, the oxide layer including wustite crystal grains of a wustite structure with a (1 1 1) plane orientation containing iron, a lattice spacing of a (1 1 1) plane of the wustite crystal grains being not less than 0.253 nanometers and not more than 0.275 nanometers.2. The element according to claim 1 , further comprising a nonmagnetic layer provided between the first magnetic layer and the second magnetic layer.3. The element according to claim 1 , wherein the oxide layer further includes wurtzite crystal grains with a (0 0 2) plane orientation containing zinc and having a portion overlapping with the wustite crystal grains when projected onto a plane parallel to a thickness direction of the oxide layer.4. The element according to claim 1 , wherein the wustite crystal grains further contain zinc.5. The element according to claim 1 , wherein the wustite crystal grains further contain at least one of cobalt and nickel.6. The element according to claim 1 , wherein the ...

MICROWAVE ASSISTED MAGNETIC RECORDING MEDIUM AND INFORMATION RECORDING APPARATUS USING THE SAME

Provided is a magnetic recording medium achieving both of reduction in switching field distribution and reduction in switching field intensity by high-frequency magnetic field, thus enabling high-density recording. Magnetic grains of the magnetic recording medium are made up of a recording layer and a resonance layer. The resonance layer is disposed closer to a protective layer than the recording layer, and a magnetic material of the recording layer has anisotropy field 1.2 times or more anisotropy field of a magnetic material of the resonance layer. The magnetic material of the recording layer has saturation magnetization substantially equal to saturation magnetization of the magnetic material of the resonance layer. At the entire resonance layer and a part of the recording layer, the magnetic grains are separated from surrounding magnetic grains by a nonmagnetic material, and at a part of the recording layer, the magnetic grains are coupled with surrounding magnetic grains. 1. A magnetic recording medium , comprising:a magnetic layer disposed on a nonmagnetic substrate, the magnetic layer including magnetic grains made up of a first recording layer and a second recording layer, the first recording layer and the second recording layer having different magnitude of anisotropy field,whereinthe first recording layer is disposed closer to the substrate than the second recording layer,a magnetic material of the first recording layer has anisotropy field 1.2 times or more anisotropy field of a magnetic material of the second recording layer,the magnetic material of the first recording layer has saturation magnetization substantially equal to saturation magnetization of the magnetic material of the second recording layer,the magnetic grains at the second recording layer are separated from surrounding magnetic grains at the second recording layer by a nonmagnetic material, andthe magnetic grains at the first recording layer are partially separated from surrounding magnetic ...

MANUFACTURING METHOD OF GLASS BLANK FOR MAGNETIC DISK, MANUFACTURING METHOD OF GLASS SUBSTRATE FOR MAGNETIC DISK, GLASS BLANK FOR MAGNETIC DISK, GLASS SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK

To provide a method for manufacturing a glass blank for magnetic disk and a method for manufacturing a glass substrate for magnetic disk, which are capable of producing a glass blank for magnetic disk having a good surface waviness by press forming, and a method for manufacturing a glass substrate for magnetic disk. A method for manufacturing a glass blank for magnetic disk, which includes a forming process of press-forming a lump of molten glass using a pair of dies, wherein in the forming process, press forming is performed using thermally equalizing means for reducing a difference in temperature in the press forming surface of the die during pressing of the molten glass. 1. A method for manufacturing a glass blank for magnetic disk , the method comprising a forming process of press-forming a lump of molten glass using a pair of dies to obtain a sheet glass material , wherein in the forming process , a difference in temperature in a press forming surface of the die is controlled so that the surface waviness of the sheet glass material is equal to 30 nm or less.2. The method for manufacturing a glass blank for magnetic disk according to claim 1 , wherein thermally equalizing means reduces the difference in temperature in the press forming surface by heat-exhausting from the press forming surface and/or heating the press forming surface.3. The method for manufacturing a glass blank for magnetic disk according to claim 1 , wherein the thermally equalizing means is a heat sink.4. The method for manufacturing a glass blank for magnetic disk according to claim 3 , wherein the heat sink is provided on at least a part of the surface opposite to the press forming surface.5. The method for manufacturing a glass blank for magnetic disk according to claim 4 , wherein the heat sink is provided so that amount of heat exhausted from a central portion of the molten glass is larger than that from the circumferential edge portion of the molten glass during the press forming.6. The ...

Write synchronization in bit patterned media using auxiliary read head

A method for recording data to a magnetic media while simultaneously reading sync and or servo data with reduced noise from the write head affecting the reading of the sync and or servo data. The invention records data using a write head of a first slider and reads the sync and or servo data from a read head located on a different slider that is facing a different disk surface than the first slider. In this way, magnetic or thermal noise from the write head does not affect the reading of the sync and or servo data.

Double-layered sheet systems

A magnetic sheet system providing flexible magnetic sheets that are digitally printable on both sides and that serve as magnetic postcard stocks for production of customized magnetic postcards.

Thin film with tuned grain size

An apparatus and associated method provides a magnetic writing element that may have at least a write pole tuned to a predetermined first grain size with a cryogenic substrate temperature. A magnetic shield can be formed with a predetermined second grain size that is tuned with the cryogenic substrate temperature.

HEXAGONAL FERRITE MAGNETIC PARTICLE AND METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING MEDIUM

An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on AlOconversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle. 1. A hexagonal ferrite magnetic particle prepared by a method of manufacturing a hexagonal ferrite magnetic particle comprising:melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material;subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment;{'sub': 2', '3, 'collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on AlOconversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.'}2. The hexagonal ferrite magnetic particle according to claim 1 , which has a coercive force ranging from 159 to 318 kA/m.3. The hexagonal ferrite magnetic particle according to claim 1 , on which surface Al is present as an oxide.4. The hexagonal ferrite magnetic particle according to claim 1 , which is comprised of a primary particle of hexagonal ferrite to ...

GLASS SUBSTRATE FOR MAGNETIC DISK AND METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK

A method for manufacturing a glass substrate for magnetic disk is provided. The method includes a forming process of press-forming a lump of molten glass using a pair of dies, wherein in the forming process, the cooling rate of the molten glass during pressing is controlled so that a first compressive stress layer is formed on a pair of principal faces of a glass blank that is press formed, and the method includes a chemically strengthening process for forming a second compressive stress layer on a pair of principal faces of a glass substrate formed using the glass blank after the forming process. 1. A method for manufacturing a glass substrate for magnetic disk , the method comprising:a forming process of press-forming a lump of molten glass using a pair of dies, during which the cooling rate of the molten glass during pressing is controlled so that a first compressive stress layer is formed on each of a pair of principal faces of a glass blank that is press formed; anda chemically strengthening process for forming a second compressive stress layer on each of a pair of principal faces of a glass substrate formed using the glass blank after the forming process.2. The method for manufacturing a glass substrate for magnetic disk according to claim 1 , wherein in the forming process claim 1 , the falling lump of molten glass is press-formed using the pair of dies from directions claim 1 , each direction being orthogonal to the falling direction.3. The method for manufacturing a glass substrate for magnetic disk according to claim 1 , wherein in the forming process claim 1 , press forming is performed so that the temperature of the press forming surface of the pair of dies is substantially identical.4. The method for manufacturing a glass substrate for magnetic disk according to claim 1 , wherein the temperature of the pair of dies is kept lower than the glass transition point (Tg) of the molten glass during a period of time from when the glass blank contacts the pair ...

Magnetic Recording Head Having a Pole Tip Shield

A write element including a pole tip shield is disclosed. In embodiments disclosed, for example, the pole tip shield includes side shield portions fabricated of a graded magnetic moment material to form graded side shield portions having a magnetic moment that decreases in the down-track direction along a length of the side shield portions. In another embodiment, the pole tip shield includes side shield portions having a shortened length extending along a partial length of side edges of the pole tip. In illustrated embodiments, the side shield portions are formed of a contoured body having an indented portion forward of the leading edge of the pole tip. The indented portion has a rounded indented surface contour forming a rounded profile for a gap region between a leading edge portion of the pole tip shield forward of the leading edge of the pole tip. 1. An assembly comprising:a magnetic pole assembly having a coil energizable to induce a magnetic flux in a pole having a pole tip including a leading edge, a trailing edge, a first side edge and a second side edge;a first side shield portion coextending along and spaced from the first side edge of the pole tip to form a gap region between the first side shield portion and the first side edge and a second side shield portion coextending along and spaced from the second side edge of the pole tip to form a gap region between the second side shield portion and the second side edge of the pole tip wherein, the first and second side shield portions are formed of a graded magnetic moment material to provide a variable magnetic moment along a length of the first and second side shield portions; anda magnetically insulating material in the gap region between the first side shield portion and the first side edge and the gap region between the second side shield portion and the second side edge.2. The assembly of wherein the magnetic moment of the graded magnetic moment material decreases in a down-track direction to provide a ...

MAGNETIC RECORDING MEDIUM COATING COMPOSITION AND MAGNETIC RECORDING MEDIUM

The magnetic recording medium coating composition includes carbon black; iron oxide; at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, and isophorone; an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and an organic acid. 1. A magnetic recording medium coating composition , which comprises:carbon black;iron oxide;at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, and isophorone;an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; andan organic acid.2. The magnetic recording medium coating composition according to claim 1 , which is a coating composition for forming a nonmagnetic layer of a magnetic recording medium comprising a nonmagnetic layer and a magnetic layer in this order on a nonmagnetic support.4. The magnetic recording medium coating composition according to claim 3 , wherein claim 3 , in formula (1) claim 3 , each of R claim 3 , R claim 3 , and Rindependently denotes a linear or branched alkyl group having 1 to 8 carbon atoms.5. The magnetic recording medium coating composition according to claim 1 , wherein the organic solvent comprises methyl ethyl ketone and/or cyclohexanone.6. The magnetic recording medium coating composition according to claim 1 , wherein the organic acid is an aliphatic or aromatic compound.7. The magnetic recording medium coating composition according to claim 1 , wherein the organic acid comprises an acid group selected from the group consisting of a carboxyl group and a phosphonic acid group.8. The magnetic recording medium coating composition according to claim 1 , wherein the organic acid is a fatty acid.9. The magnetic recording medium coating composition according to claim 1 , which further comprises a binder resin.10. The magnetic recording medium coating composition ...

CARBON BLACK COMPOSITION, CARBON BLACK-CONTAINING COATING FILM, AND MAGNETIC RECORDING MEDIUM COMPRISING THE SAME

The carbon black composition includes carbon black and an amine compound denoted by formula (1) in a solvent: 2. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , each of W and Z independently denote a substituent that comprises at least one carbon atom and binds claim 1 , through the carbon atom claim 1 , to a carbon atom to which the substituent substitutes.3. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , each of U claim 1 , V claim 1 , X claim 1 , Y claim 1 , W and Z independently denotes an alkyl group.4. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , n denotes 2.5. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , each of U claim 1 , V claim 1 , X claim 1 , Y claim 1 , W and Z independently denotes an alkyl group claim 1 , and n denotes 2.6. The carbon black composition according to claim 1 , which further comprises a resin.7. The carbon black composition according to claim 6 , wherein the resin comprises a resin selected from the group consisting of polyurethane and a vinyl copolymer.8. The carbon black composition according to claim 5 , wherein the solvent comprises a ketone solvent.9. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , all of U claim 1 , V claim 1 , X claim 1 , Y claim 1 , W and Z denote a methyl group.10. The carbon black composition according to claim 1 , wherein claim 1 , in formula (1) claim 1 , all of U claim 1 , V claim 1 , X claim 1 , Y claim 1 , W and Z denote a methyl group claim 1 , and n denotes 2.11. The carbon black composition according to claim 10 , which further comprises a resin.12. The carbon black composition according to claim 11 , wherein the resin comprises a resin selected from the group consisting of polyurethane and a vinyl copolymer.13. The carbon black composition according to claim 10 , ...

MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME

The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nmto 2,400 nm, and a ratio of the crystallite size Dobtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization Das determined by observation with a transmission electron microscope, D/D, is greater than or equal to 1.1. 1. A magnetic recording medium ,which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and{'sup': 3', '3, 'sub': x(107)', 'TEM', 'x(107)', 'TEM, 'the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nmto 2,400 nm, and a ratio of the crystallite size Dobtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization Das determined by observation with a transmission electron microscope, D/D, is greater than or equal to 1.1.'}2. The magnetic recording medium according to claim 1 ,{'sub': x(107)', 'TEM, 'wherein the ferromagnetic hexagonal ferrite powder has the D/Dof greater than or equal to 1.1 but less than or equal to 1.5.'}3. The magnetic recording medium according to claim 1 ,{'sup': 3', '3, 'wherein the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nmto 2,000 nm.'}4. The magnetic recording medium according to claim 2 ,{'sup': 3', '3, 'wherein the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nmto 2,000 nm.'}5. The magnetic recording medium according to claim 1 , ...

Method of manufacturing hexagonal ferrite powder, hexagonal ferrite powder, magnetic recording medium and method of manufacturing magnetic recording medium

The method of manufacturing hexagonal ferrite powder includes preparing a hexagonal ferrite precursor by mixing an iron salt and a divalent metal salt in a water-based solution, and converting the hexagonal ferrite precursor into hexagonal ferrite within a reaction flow passage, within which a fluid flowing therein is subjected to heating and pressurizing, by continuously feeding a water-based solution containing the hexagonal ferrite precursor and gelatin to the reaction flow passage.

MAGNETIC TAPE APPARATUS

A magnetic tape apparatus, in which a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element. 1. A magnetic tape apparatus comprising:a magnetic tape;a reading element unit; andan extraction unit,wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,the magnetic layer includes a servo pattern,the ferromagnetic powder is a hexagonal ferrite powder,a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00,the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, andthe ...

DISK DEVICE

According to one embodiment, a disk device includes a housing, plurality of magnetic disks that are rotatable in the housing, magnetic heads which process data with respect to the respectively magnetic disks, a head actuator provided in the housing and supporting the magnetic heads to be movable and a capturing part formed of a material that is as easily or more easily electrostatically chargeable as or than a polycarbonate-based material in a triboelectric series, and disposed in the housing. 1. A disk device comprising:a housing;a magnetic disk that is rotatable in the housing;a magnetic head which processes data with respect to the magnetic disk;a head actuator provided in the housing and supporting the magnetic head to be movable; anda capturing part formed of a material that is as easily or more easily electrostatically chargeable as or than a polycarbonate-based material in a triboelectric series, and disposed in the housing.2. The disk device of claim 1 , further comprising:a regulator which applies a voltage of a reversed polarity to that of the capturing part to between the magnetic head and the magnetic disk.3. The disk device of claim 2 , whereina voltage applied to the magnetic head is 0.5 V or higher but 1 V or less.4. The disk device of claim 1 , wherein the capturing part is arranged in a position contactable with an air stream to occur by rotation of the magnetic disk.5. The disk device of claim 1 , wherein the capturing part is a filter comprising a case formed of the material and a moisture absorbent accommodated in the case.6. The disk device of claim 1 , wherein the capturing part is a spoiler formed of the material and disposed in a vicinity of an outer circumference of the magnetic disk.7. The disk device of claim 1 , whereinthe capturing part is a ramp formed of the material and disposed in a vicinity of an outer circumference of the magnetic disk.8. The disk device of claim 1 , whereinthe material is a synthetic resin which is easily ...

PERPENDICULAR WRITE HEAD WITH LAMINATED SIDE SHIELDS

A perpendicular write head, the write head having an air bearing surface, the write head including a magnetic write pole, wherein at the air bearing surface, the write pole has a trailing side, a leading side that is opposite the trailing side, and first and second sides; side gaps, wherein the side gaps are proximate the write pole along the first and second side edges; and side shields proximate the side gaps, wherein the side shields have gap facing surfaces and include at least one set of alternating layers of magnetic and non-magnetic materials, wherein only one kind of material makes up the gap facing surfaces at the air bearing surfaces. 120-. (canceled)21. A method of forming laminated side shields comprising the steps of:forming a conductive seedlayer;forming a block that encapsulates the conductive seedlayer, the block having vertical side walls and a top;forming a layer of magnetic material on at least one of the vertical side walls of the block by electroplating; andforming a layer of non-magnetic material on the layer of magnetic material by electroplating.22. The method according to claim 21 , wherein the conductive seedlayer is formed on or within a substrate.23. The method according to claim 22 , wherein the substrate is configured to allow electrical connection to the conductive seedlayer.24. The method according to claim 23 , wherein the conductive seedlayer is grounded to the substrate.25. The method according to claim 23 , wherein the conductive seedlayer is formed in electrical contact with a conductive non-plating trace.26. The method according to claim 21 , wherein the conductive seedlayer comprises Ru claim 21 , NiFe claim 21 , NiP claim 21 , or combinations thereof.27. The method according to claim 25 , wherein the conductive non-plating trace comprises chromium or tantalum.28. The method according to claim 21 , wherein the block comprises a conductive material.29. The method according to claim 28 , wherein the conductive material comprises ...

IN-PIVOT HYBRID STEPPER MOTOR FOR BALL SCREW CAM ELEVATOR MECHANISM FOR REDUCED-HEAD HARD DISK DRIVE

An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with a hybrid permanent magnet (PM)-variable reluctance (VR) stepper motor disposed therein, to rotate the cam screw, which vertically translates an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. A suitably configured hybrid stepper motor can provide 200 full steps/rev for a 3.8 mm translation. Thus, to meet or surpass a step resolution of 6 μm/μstep or 0.5625°/μstep, the hybrid stepper motor would only need to be operated at 4 micro-step mode in order to achieve a 0.45°/μstep or 0.00475 mm/μstep, which enables a smoother motion since the available holding torque at the 4micro-step provides sufficient torque margin to overcome load torque, frictional torque, and detent torque. 1. An actuator system for a reduced-head hard disk drive (HDD) , the system comprising:a ball screw cam assembly;a head-stack assembly (HSA) translatably coupled with the cam assembly;a permanent magnet (PM)-variable reluctance (VR) hybrid stepper motor disposed within and affixed to a screw of the cam assembly, and configured to drive rotation of the screw to drive translation of the HSA along an axis of the screw; anda fixed shaft around which the stepper motor is positioned; a plurality of ring-shaped permanent magnets (PMs),', 'a stack of electrical steel lamination rings interposed between each adjacent pair of the PMs,', 'wherein the PMs and the lamination rings are affixed to an inner diameter of the screw and collectively operate as a rotor of the hybrid stepper motor,', 'a stator, disposed within the rotor, comprising a stack of electrical steel laminations configured with a plurality of main poles each having a plurality of teeth, and', 'a coil wound on each of the main poles., 'wherein the hybrid stepper motor is rotatable about the fixed shaft to drive the ...

MAGNETIC RECORDING MEDIUM

A magnetic recording medium is provided and includes a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in this order, in which an average thickness tof the magnetic recording medium is 3.5 μm≤t≤5.3 μm, a dimensional variation Δw in a width direction of the magnetic recording medium to tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw≤2000 ppm/N, and an average thickness tof the non-magnetic layer is t≤1.0 μm. 2. The magnetic recording medium according to claim 1 , wherein a squareness ratio in a vertical direction of the magnetic recording medium is 65% or more.3. The magnetic recording medium according to claim 1 , wherein the dimensional variation Δw is 750 ppm/N≤Δw≤2000 ppm/N.4. The magnetic recording medium according to claim 1 , wherein the dimensional variation Δw is 800 ppm/N≤Δw≤2000 ppm/N.5. The magnetic recording medium according to claim 1 , wherein the layer structure includes a back layer on the opposite side of the non-magnetic layer of the base layer claim 1 , and a surface roughness Rof the back layer is 3.0 nm≤R≤7.5 nm.6. The magnetic recording medium according to claim 1 , wherein the layer structure comprises a back layer on an opposite side of the non-magnetic layer of the base layer claim 1 , and a coefficient of friction μ between a surface of the magnetic recording medium on a side of the magnetic layer and a surface on a side of the back layer is 0.20≤μ≤0.80.7. The magnetic recording medium according to claim 1 , wherein a thermal expansion coefficient α is 6 ppm/° C.≤α≤9 ppm/° C. claim 1 , and a humidity expansion coefficient β is β≤5.5 ppm/% RH.8. The magnetic recording medium according to claim 1 , wherein a Poisson's ratio ρ is 0.25≤ρ.9. The magnetic recording medium according to claim 1 , wherein an elastic limit value σin the longitudinal direction is 0.7 N≤σ claim 1 , and wherein the elastic limit value σis determined by pulling a sample of the magnetic ...

MAGNETIC DISC, ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISC, AND PRODUCTION METHOD FOR ALUMINUM ALLOY SUBSTRATE

Provided are a magnetic disk and a method of fabricating the magnetic disk. The magnetic disk includes an aluminum alloy plate fabricated by a process involving a CC method and a compound removal process, and an electroless Ni—P plating layer disposed on the surface of the plate. The aluminum alloy plate is composed of an aluminum alloy containing 0.4 to 3.0 mass % (hereinafter abbreviated simply as “%”) of Fe, 0.1% to 3.0% of Mn, 0.005% to 1.000% of Cu, 0.005% to 1.000% of Zn, with a balance of Al and unavoidable impurities. In the magnetic disk, the maximum amplitude of waviness in a wavelength range of 0.4 to 5.0 mm is 5 nm or less, and the maximum amplitude of waviness in a wavelength range of 0.08 to 0.45 mm is 1.5 nm or less. 1. (canceled)2. (canceled)3. An aluminum alloy substrate for a magnetic disk , the substrate comprising:an aluminum alloy provided with electroless Ni—P plating, whereinthe aluminum alloy comprises 0.4 to 3.0 mass % of Fe, 0.1 to 3.0 mass % of Mn, 0.005 to 1.0 mass % of Cu, and 0.005 to 1.0 mass % of Zn, with a balance of Al and unavoidable impurities,a maximum amplitude of waviness in a wavelength range of 0.4 to 5.0 mm is 5.0 nm or less, and a maximum amplitude of waviness in a wavelength range of 0.08 to 0.45 mm is 1.5 nm or less on a surface of the aluminum alloy substrate, anda yield stress after retention at 300° C. for three hours is 100 MPa or more.4. (canceled)5. (canceled)6. The aluminum alloy substrate for a magnetic disk according to claim 3 , wherein the aluminum alloy further comprises one or more elements selected from a group comprising 0.1 to 0.4 mass % of Si claim 3 , 0.1 to 3.0 mass % of Ni claim 3 , 0.01 to 1.00 mass % of Cr claim 3 , and 0.01 to 1.00 mass % of Zr.7. The aluminum alloy substrate for a magnetic disk according to claim 3 , wherein the aluminum alloy further comprises one or more elements selected from a group comprising Ti claim 3 , B claim 3 , and V at a total content of 0.005 to 0.5 mass %.8. A method ...

MAGNETIC RECORDING MEDIUM AND CARTRIDGE

[Object] Provided is a technology that is capable of further improving a recording density of data. 1. A magnetic recording medium in a shape of a tape that is long in a longitudinal direction and is short in a width direction , the medium comprising:a base material;a magnetic layer; anda non-magnetic layer that is provided between the base material and the magnetic layer, and contains one or more types of non-magnetic inorganic particles, whereinthe magnetic layer includes a data band long in the longitudinal direction in which a data signal is to be written, and a servo band long in the longitudinal direction in which a servo signal is written, and in the magnetic layer, a degree of vertical orientation is greater than or equal to 65%, a half width of a solitary waveform in a reproduction waveform of the servo signal is less than or equal to 195 nm, and a thickness of the magnetic layer is less than or equal to 90 nm, and{'sup': −5', '3, 'the non-magnetic layer contains at least Fe-based non-magnetic particles as the non-magnetic inorganic particles, and in the non-magnetic layer, an average particle volume of the Fe-based non-magnetic particles is less than or equal to 2.0×10μm, and a thickness of the non-magnetic layer is less than or equal to 1.1 μm.'}2. The magnetic recording medium according to claim 1 , wherein{'sup': −5', '3, 'the average particle volume of the Fe-based non-magnetic particles is less than or equal to 1.0×10μm.'}3. The magnetic recording medium according to claim 1 , whereinthe half width of the solitary waveform is less than or equal to 180 nm.4. The magnetic recording medium according to claim 3 , whereinthe half width of the solitary waveform is less than or equal to 160 nm.5. The magnetic recording medium according to claim 4 , whereinthe half width of the solitary waveform is less than or equal to 140 nm.6. The magnetic recording medium according to claim 5 , whereinthe half width of the solitary waveform is less than or equal to 120 nm ...

DUAL ACTUATOR STORAGE DEVICE UTILIZING MULTIPLE DISK ZONES

A recording surface of a magnetic disk is divided into first and second zones. A first head of a first actuator arm assembly reads from and/or writes to the first zone exclusively. A second head of a second actuator arm assembly reads from and/or writes to the second zone exclusively. The first and second head are capable of simultaneously reading from and writing to the recording surface. 1. An apparatus , comprising:a first actuator assembly comprising a first head configured to write to a recording surface of a magnetic disk, the first actuator assembly rotating about a first axis;a second actuator assembly comprising a second head configured to write to the recording surface simultaneously with the first head, the first actuator assembly rotating about a second axis separate from the first axis; and divide the recording surface into first and second zones that comprise respective inner and outer annuli of the recording surface; and', 'cause the first and second heads to write exclusively to the first and second zones respectively, wherein the first head and the second head are optimized for reduced skew angles in the inner and outer annuli., 'a controller coupled to the first and second actuator assemblies, the controller configured to2. The apparatus of ; wherein the outer annuli and second head are configured for high data rate/low areal density and the inner annuli and first head are configured for low data rate/high areal density.3. The apparatus of claim 1 , wherein a first bit-aspect ratio that is optimal for the first head is used to write to the first zone claim 1 , and where a second bit-aspect ratio that is optimal for the second head is used to write to the second zone claim 1 , the first bit-aspect ratio being different than the first bit-aspect ratio.4. The apparatus of claim 1 , wherein the first and second heads can both read from e first and second zones.5. The apparatus of claim 1 , wherein the first and second heads can read from the recording ...

METHOD FOR FORMING PRINTED MATERIAL AND SYSTEM FOR FORMING PRINTED MATERIAL

A method for forming a printed material includes forming an image on a recording medium; applying particles to a surface of the recording medium, the surface having the image formed thereon; heating the particles applied to the recording medium; and pressurizing, in a thickness direction, a multilayer body obtained by folding the recording medium so that the heated particles are sandwiched between flaps of the recording medium or a multilayer body obtained by placing another medium on top of the recording medium with the heated particles therebetween. The particles contain a styrene resin and a (meth)acrylic acid ester resin. The (meth)acrylic acid ester resin contains two (meth)acrylic acid ester monomer units, and a mass ratio of the (meth)acrylic acid ester monomer units relative to a total of polymerization components is 90 mass % or more. 1. A method for forming a printed material , the method comprising:forming an image on a recording medium;applying particles to a surface of the recording medium, the surface having the image formed thereon;heating the particles applied to the recording medium; andpressurizing, in a thickness direction, a multilayer body obtained by folding the recording medium so that the heated particles are sandwiched between flaps of the recording medium or a multilayer body obtained by placing another medium on top of the recording medium with the heated particles therebetween,wherein the particles contain a styrene resin and a (meth)acrylic acid ester resin,the (meth)acrylic acid ester resin contains two (meth)acrylic acid ester monomer units, and a mass ratio of the (meth)acrylic acid ester monomer units relative to a total of polymerization components is 90 mass % or more, andthe particles have two glass transition temperatures, and a difference between the lowest glass transition temperature and the highest glass transition temperature is 30° C. or more.2. The method for forming a printed material according to claim 1 , wherein the ...

Generating position error signal based on data tracks for rotating storage data storage

A system including an inter-track interference detection module and a position error signal generation module. The inter-track interference detection module determines a first inter-track interference value based on a first signal from a first sensor positioned over a first track of a rotating storage medium. The first inter-track interference value indicates energy contributed by tracks adjacent to the first track compared to energy contributed by the first track. The inter-track interference detection module determines a second inter-track interference value based on a second signal from a second sensor positioned over a second track of the rotating storage medium. The second inter-track interference value indicates energy contributed by tracks adjacent to the second track compared to energy contributed by the second track. The position error signal generation module generates a position error signal based on the first inter-track interference value and the second inter-track interference value.

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5. 1. A magnetic recording medium comprising:a non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,whereinan average particle size of the ferromagnetic powder is 10 nm to 21 nm, andthe isoelectric point of the surface zeta potential of the magnetic layer is equal to or greater than 5.5.2. The magnetic recording medium according to claim 1 ,wherein the isoelectric point is 5.5 to 7.0.3. The magnetic recording medium according to claim 1 ,wherein the binding agent is a binding agent including an acidic group.4. The magnetic recording medium according to claim 3 ,wherein the acidic group includes at least one kind of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.5. The magnetic recording medium according to claim 2 ,wherein the binding agent is a binding agent including an acidic group.6. The magnetic recording medium according to claim 5 ,wherein the acidic group includes at least one kind of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.7. The magnetic recording medium according to claim 1 , further comprising:a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.8. The magnetic recording medium according to claim 1 , further comprising:a back coating layer including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer. This application is a continuation of application Ser. No. 16/009,461 filed Jun. 15, 2018, which claims priority under 35 U.S.C 119 to Japanese Patent ...

COBALT FERRITE MAGNETIC POWDER, METHOD OF PRODUCING THE SAME, AND MAGNETIC RECORDING MEDIUM

[Object] A cobalt ferrite magnetic powder includes magnetic particles that have a uniaxial crystal magnetic anisotropy and contain cobalt ferrite. A peak top 2θ of a (3, 1, 1) plane determined by powder X-ray diffractometry using a CoKα ray is 41.3° or more and 41.5° or less. Some Cos contained in the magnetic particles are substituted with at least one selected from the group consisting of Zn, Ge, and a transition metal element other than Fe. 1. A cobalt ferrite magnetic powder , comprising:magnetic particles that have a uniaxial crystal magnetic anisotropy and contain cobalt ferrite, whereina peak top 2θ of a (3, 1, 1) plane determined by powder X-ray diffractometry using a CoKα ray is 41.3° or more and 41.5° or less, andsome Cos contained in the cobalt ferrite are substituted with at least one selected from the group consisting of Zn, Ge, and a transition metal element other than Fe.2. The cobalt ferrite magnetic powder according to claim 1 , whereina molar ratio (Co/Fe) of Co to Fe is 0.2 or more and less than 0.5.3. The cobalt ferrite magnetic powder according to claim 1 , whereinthe transition metal element include at least one selected from the group consisting of Mn, Ni, Cu, Ta, and Zr.4. The cobalt ferrite magnetic powder according to claim 1 , whereinthe transition metal element includes Cu.5. The cobalt ferrite magnetic powder according to claim 1 , whereinan average particle size is 25 nm or less.6. The cobalt ferrite magnetic powder according to claim 1 , whereina relative standard deviation of a particle size is 50% or less.7. The cobalt ferrite magnetic powder according to claim 1 , whereina coercive force Hc is 2500 Oe or more.8. The cobalt ferrite magnetic powder according to claim 1 , whereinSFD (Switching Field Distribution) is 2.0 or less.9. A tape-shaped magnetic recording medium claim 1 , comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a magnetic layer including the cobalt ferrite magnetic powder according to .'}10. A method of ...

BASE FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC STORAGE APPARATUS

A base for a magnetic recording medium, includes an aluminum alloy substrate, and a nickel alloy film provided on at least one principal surface of the aluminum alloy substrate. The nickel alloy film includes Mo in a range of 0.5 wt % to 3 wt %, P in a range of 11 wt % to 15 wt %, and Al in a range of 0.001 wt % to 0.1 wt %. 1. A base for a magnetic recording medium , comprising:an aluminum alloy substrate; anda nickel alloy film provided on at least one principal surface of the aluminum alloy substrate,wherein the nickel alloy film includes Mo in a range of 0.5 wt % to 3 wt %, P in a range of 11 wt % to 15 wt %, and Al in a range of 0.001 wt % to 0.1 wt %.2. The base for the magnetic recording medium as claimed in claim 1 , wherein a height of a minute surface waviness generated on a surface of the nickel alloy film is 0.100 nm or less when the base is heated under a heating condition of 20 minutes at 320° C. during evaluation of the base.3. The base for the magnetic recording medium as claimed in claim 1 , wherein a number of micro-bulges generated at a surface of the nickel alloy film and having a height of 1 nm or greater is less than 0.050 bulges/cmwhen the base is heated under a heating condition of 20 minutes at 320° C. during evaluation of the base.4. The base for the magnetic recording medium as claimed in claim 1 , where the nickel alloy film is a film of a NiMoP-based alloy including Mo claim 1 , P claim 1 , and Al as first additional elements claim 1 , with Ni as a remainder.5. The base for the magnetic recording medium as claimed in claim 4 , wherein the nickel alloy film further includes one or more elements selected from a group consisting of Cr claim 4 , Zn claim 4 , Ba claim 4 , Pb claim 4 , or the like claim 4 , as second additional elements claim 4 , and a content of the second additional elements is less than 0.001 wt %.6. A magnetic recording medium comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the base for the magnetic recording ...

BASE FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC STORAGE APPARATUS

A base for a magnetic recording medium, includes an aluminum alloy substrate, and a nickel alloy film provided on at least one principal surface of the aluminum alloy substrate. The nickel alloy film includes Mo in a range of 0.5 wt % to 3 wt %, P in a range of 11 wt % to 15 wt %, and Fe in a range of 0.0001 wt % to 0.001 wt %. 1. A base for a magnetic recording medium , comprising:an aluminum alloy substrate; anda nickel alloy film provided on at least one principal surface of the aluminum alloy substrate,wherein the nickel alloy film includes Mo in a range of 0.5 wt % to 3 wt %, P in a range of 11 wt % to 15 wt %, and Fe in a range of 0.0001 wt % to 0.001 wt %.2. The base for the magnetic recording medium as claimed in claim 1 , wherein a height of a minute surface waviness generated on a surface of the nickel alloy film is 0.100 nm or less when the base is heated under a heating condition of 20 minutes at 320° C. during evaluation of the base.3. The base for the magnetic recording medium as claimed in claim 1 , wherein a number of micro-bulges generated at a surface of the nickel alloy film and having a height of 1 nm or greater is less than 0.060 bulges/cmwhen the base is heated under a heating condition of 20 minutes at 320° C. during evaluation of the base.4. The base for the magnetic recording medium as claimed in claim 1 , where the nickel alloy film is a film of a NiMoP-based alloy including Mo claim 1 , P claim 1 , and Fe as first additional elements claim 1 , with Ni as a remainder.5. The base for the magnetic recording medium as claimed in claim 4 , wherein the nickel alloy film further includes one or more elements selected from a group consisting of Cr claim 4 , Zn claim 4 , Ba claim 4 , and Pb claim 4 , as second additional elements claim 4 , and a content of the second additional elements is less than 0.001 wt %.6. A magnetic recording medium comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the base for the magnetic recording medium ...

CONDUCTIVE POLYMERS FOR USE IN MAGNETIC MEDIA

According to one embodiment, a magnetic recording medium includes: a substrate; an underlayer positioned above the substrate; a magnetic recording layer positioned above the underlayer; and a plurality of conductive polymers dispersed within the substrate, the underlayer, the magnetic recording layer, the substrate and the underlayer, the substrate and the magnetic recording layer, the underlayer and the magnetic recording layer, or the underlayer, the magnetic recording layer, and the substrate. In addition, the conductive polymers are dispersed such that a concentration of the conductive polymers has a gradient in a single one of the layers in a thickness direction. 1. A magnetic recording medium , comprising:a substrate;an underlayer positioned above the substrate;a magnetic recording layer positioned above the underlayer; anda plurality of conductive polymers dispersed within the substrate, the underlayer, the magnetic recording layer, the substrate and the underlayer, the substrate and the magnetic recording layer, the underlayer and the magnetic recording layer, or the underlayer, the magnetic recording layer, and the substrate,wherein the conductive polymers are dispersed such that a concentration of the conductive polymers has a gradient in a single one of the layers in a thickness direction.2. The magnetic recording medium as recited in claim 1 , wherein the magnetic recording medium has a surface electrical resistance of between 10to 10Ω/sq.3. The magnetic recording medium as recited in claim 1 , wherein the plurality of conductive polymers are in nanofiber form having a diameter of nanometer scale claim 1 , wherein the conductive polymers have a diameter that is uniform along a length thereof.4. The magnetic recording medium as recited in claim 1 , wherein each of the conductive polymers has a molecular weight in a range between about 400 to about 600 claim 1 ,000 amu.5. The magnetic recording medium as recited in claim 1 , wherein each of the conductive ...

CURRENT-PERPENDICULAR-TO-PLANE GIANT MAGNETORESISTIVE ELEMENT, PRECURSOR THEREOF, AND MANUFACTURING METHOD THEREOF

Provided is a precursor of a current-perpendicular-to-plane giant magnetoresistive element having a laminated structure of ferromagnetic metal layer/nonmagnetic metal layer/ferromagnetic metal layer, the precursor having a nonmagnetic intermediate layer containing a non-magnetic metal and an oxide in a predetermined ratio such that the distribution thereof is nearly uniform at the atomic level. Also provided is a current-perpendicular-to-plane giant magnetoresistive element having a current-confinement structure (CCP) which has: a current confinement structure region made of a conductive alloy and obtained by heat-treating a laminated structure of a ferromagnetic metal layer and a nonmagnetic intermediate layer at a predetermined temperature; and a high-resistance metal alloy region containing an oxide and surrounding the current confinement structure region. 1. A precursor of a current-perpendicular-to-plane giant magnetoresistance element having a laminate structure of a ferromagnetic metal layer/a non-magnetic metal layer/a ferromagnetic metal layer , comprisingthe non-magnetic spacer layer containing a non-magnetic metal and an oxide at a predetermined ratio and containing the non-magnetic metal and the oxide in a roughly uniform manner at an atomic level.2. The precursor of a current-perpendicular-to-plane giant magnetoresistance element according to claim 1 , whereinthe non-magnetic metal is at least one substance selected from among Cu, Ag, Au and an alloy thereof, and{'sub': 2', '3', '2', '2', '3, 'the oxide is at least one substance selected from among InO, ZnO, SnO, GaO, and a mixture thereof.'}3. The precursor of a current-perpendicular-to-plane giant magnetoresistance element according to claim 2 , whereinthe non-magnetic metal is Ag,{'sub': 2', '3, 'the oxide is InZnO (a mixture of InOand ZnO), and'}the precursor of a current-perpendicular-to-plane giant magnetoresistance element comprises the non-magnetic spacer layer consisting of a AgInZnO single- ...

MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS

The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a servo pattern, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape. 1. A magnetic tape comprising:a non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,wherein the magnetic layer has a servo pattern,the absolute value ΔN of the difference between the refractive index Nxy measured regarding an in-plane direction of the magnetic layer and the refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, andthe vertical squareness ratio of the magnetic tape is 0.60 to 1.00.2. The magnetic tape according to claim 1 ,wherein Nxy is greater than Nz and the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40.3. The magnetic tape according to claim 1 , further comprising:a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.4. The magnetic tape according to claim 3 ,wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 0.60 μm.5. The magnetic tape according to claim 1 , further comprising:a back coating layer including non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.6. The magnetic tape according to claim 1 ,wherein the servo pattern is a timing-based servo pattern.7. The magnetic tape according to claim 1 ,wherein the vertical squareness ratio of the magnetic tape is ...

MAGNETIC RECORDING MEDIUM

The average thickness tof a magnetic recording medium meets the requirement that t≤5.5 [μm], and the dimensional change amount Δw in the width direction of the magnetic recording medium with respect to the tension change in the longitudinal direction of the magnetic recording medium meets the requirement that 700 ppm/N≤Δw. 2. The magnetic recording medium according to claim 1 , wherein the dimensional change amount Δw satisfies 750 ppm/N≤Δw≤8000 ppm/N.3. The magnetic recording medium according to claim 1 , wherein the dimensional change amount Δw satisfies 800 ppm/N≤Δw≤8000 ppm/N.4. The magnetic recording medium according to claim 1 , whereina temperature expansion coefficient α of the magnetic recording medium satisfies 6 ppm/° C.≤α≤8 ppm/° C., anda humidity expansion coefficient β of the magnetic recording medium satisfies β≤5 ppm/% RH.5. The magnetic recording medium according to claim 1 , wherein a Poisson's ratio ρ of the magnetic recording medium satisfies 0.3≤ρ.6. The magnetic recording medium according to claim 1 , wherein an elastic limit value σin the longitudinal direction of the magnetic recording medium satisfies 0.8 N≤σand the elastic limit value σdoes not depend on a rate V in elastic limit measurement.7. The magnetic recording medium according to claim 1 , wherein an arithmetic mean roughness Ra of a magnetic surface of the magnetic recording medium is 2.0 nm or less.8. The magnetic recording medium according to claim 1 , further comprisinga magnetic surface and a back surface on an opposite side to the magnetic surface, whereinan interlayer friction coefficient μ between the magnetic surface and the back surface satisfies 0.20≤μ≤0.80.9. The magnetic recording medium according to claim 1 , wherein the squareness ratio in the perpendicular direction of the magnetic recording medium is 73% or more.10. The magnetic recording medium according to claim 1 , wherein a ratio R (=Hc(50)/Hc(25)*100) between a coercive force Hc (50) measured in a perpendicular ...

Calibrated Device And Method to Detect Material Features on a Spinning Surface by Generation and Detection of Gravito-magnetic Energy

A head-disk assembly device, “mass spin-valve” or “gravitational rectifier” and method of producing gravitomagnetic induction utilizing Nano-features fabricated on the surface of a hard disk is presented. The Nano-features may include Nano-bumps and Nano-pits. The device includes a computer hard disk, a piezoelectric glide head and/or a GMR read head, a typical hard drive's electronics, wherein defects are fabricated on the said disk using a Focused Ion Beam (FIB) by depositing requisite number of nanobumps of specified height, and etching equal number of nanopits of specified depth a few mils or mm apart on a pre-decided radius. By spinning the said nano-features disk produce (1) an associated mechanical force utilizing a piezoelectric glide head and/or (2) an associated magnetic force utilizing a GMR read head for (a) general use in surface characterization work and (b) for producing power by the presence or the absence of matter on a spinning disk.

METHOD FOR FORMING PARTICLE LAYER AND METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM

A method for forming a particle layer includes covering surfaces of particles with a first polymer, covering a surface of a substrate with a second polymer having a same skeletal structure as the first polymer, and applying a liquid in which the particles covered with the first polymer are dispersed, onto the surface of the substrate covered with the second polymer. 1. A method for forming a particle layer , comprising:covering surfaces of particles with a first polymer;covering a surface of a substrate with a second polymer having a same skeletal structure as the first polymer; andapplying a liquid in which the particles covered with the first polymer are dispersed, onto the surface of the substrate covered with the second polymer.2. The method according to claim 1 , whereinthe liquid is an organic material having a chain structure.3. The method according to claim 2 , whereinthe liquid has a keton structure, anda relative dielectric constant thereof is equal to or greater than 10.4. The method according to claim 3 , whereinthe liquid is methyl ethyl ketone or methyl propyl ketone.5. The method according to claim 1 , whereinthe particles include an inorganic material containing at least one material selected from a group consisting of aluminum, silicon, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, yttrium, zirconium, tin, molybdenum, tantalum, tungsten, gold, silver, palladium, copper, and platinum.6. The method according to claim 1 , whereina number average molecular weight of the second polymer is greater than that of the first polymer.7. The method according to claim 1 , whereinthe first polymer is polystyrene having a number average molecular weight of 1,000 to 50,000.8. The method according to claim 1 , whereinthe second polymer is polystyrene having a number average molecular weight of 1,000 to 50,000.9. The method according to claim 1 , whereinthe applying of the liquid is carried out by a dip coating method.10. A method for ...

MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD

According to one embodiment, there is provided a magnetic recording medium manufacturing method including forming a bonding layer on a substrate, forming a holding layer containing silicon on the bonding layer, forming a single-particle layer on the holding layer using particles containing metal fusible on the bonding layer, etching SiOin the holding layer using an etching solution containing HF and HO, filling the holding layer with the particles until the particles are brought into contact with the bonding layer, bonding the particles and the bonding layer together by heating, and forming a magnetic recording layer on the single-particle layer. 1. A magnetic recording medium manufacturing method comprising:forming a bonding layer containing first metal on a substrate;forming a holding layer containing silicon on the bonding layer;forming a single-particle layer on the holding layer using particles containing second metal bondable in a solid state on the bonding layer;etching silicon using an etching solution containing hydrofluoric acid and hydrogen peroxide solution and embedding the holding layer with the particles until the particles are brought into contact with the bonding layer, the silicon being formed by oxidation reaction of the holding layer under catalysis of the second metal in a region that contacts the particles;bonding the particles and the bonding layer together by heating; andforming a magnetic recording layer on the single-particle layer.2. The method according to claim 1 , wherein the first metal is selected from the group consisting of gold claim 1 , silver claim 1 , platinum and palladium.3. The method according to claim 1 , wherein the second metal is selected from the group consisting of gold claim 1 , silver claim 1 , platinum and palladium.4. The method according to claim 1 , wherein the first metal and the second metal are same metal.5. The method according to claim 4 , wherein the first metal and the second metal are gold.6. The method ...

ROW BAR AND WAFER FOR FORMING MAGNETIC HEADS

A row bar for forming magnetic heads includes a row of magnetic head forming portions each having a magnetic head and a cutting portion adjacent to the magnetic heads. A row of bonding pads and a first ELG pad are provided at the magnetic head, a second ELG pad is provided at the cutting portion, both of the first and the second ELG pads are adapted for contacting with a probe during lapping process, and a conductive structure that is higher than surfaces of the first and the second ELG pads is formed at peripheries of the first and the second ELG pads respectively. Due to the conductive structures, a probe used in lapping process will be prevented from shifting from the ELG pads to ensure a stable contact, thereby obtaining efficient and accurate resistance measurement. 1. A row bar for forming magnetic heads , comprising a row of magnetic head forming portions each of which has a magnetic head to be cut from the row bar and a cutting portion adjacent to the magnetic head , a row of bonding pads and a first electrical lapping guide pad being provided at the magnetic head , a second electrical lapping guide pad being provided at the cutting portion , both of the first and the second electrical lapping guide pads being adapted for contacting with a probe during lapping process , wherein a conductive structure that is higher than surfaces of the first and the second electrical lapping guide pads is formed at peripheries of the first and the second electrical lapping guide pads respectively.2. The row bar for forming magnetic heads according to claim 1 , wherein the conductive structures are formed around the peripheries of the first and the second electrical lapping guide pads respectively.3. The row bar for forming magnetic heads according to claim 1 , wherein the conductive structures are arranged at two opposite sides of the first and the second electrical lapping guide pads.4. The row bar for forming magnetic heads according to claim 1 , wherein the conductive ...

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a non-magnetic support and a magnetic layer, wherein the magnetic layer contains ferromagnetic hexagonal ferrite powder and an abrasive, Int (110)/Int (114) of a crystal structure of the hexagonal ferrite determined by performing XRD analysis on the magnetic layer by using an In-Plane method is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, one or more kinds of components selected from the group consisting of a fatty acid and a fatty acid amide is contained in a magnetic layer side portion on the support, and a C—H-derived C concentration obtained by ESCA within a surface of the magnetic layer at a photoelectron take-off angle of 10° is equal to or higher than 45 at %. 1. A magnetic recording medium comprising:a non-magnetic support; anda magnetic layer which is provided on the support,wherein the magnetic layer contains ferromagnetic powder, a binder and an abrasive,the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0,a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00,one or more kinds of components selected from the group consisting of a fatty acid and a fatty acid amide is contained in a magnetic layer side portion on the support, anda C—H-derived C concentration calculated from a C—H peak surface area ratio in a C1s spectrum, which is obtained by X-ray photoelectron ...

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a non-magnetic support and a magnetic layer which contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, Int (110)/Int (114) of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a logarithmic decrement obtained by performing a pendulum viscoelasticity test on a surface of the magnetic layer is equal to or lower than 0.050. 1. A magnetic recording medium comprising:a non-magnetic support; anda magnetic layer which is provided on the support and contains ferromagnetic powder and a binder,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,the magnetic layer contains an abrasive,an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0,a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, anda logarithmic decrement obtained by performing a pendulum viscoelasticity test on a surface of the magnetic layer is equal to or lower than 0.050.2. The magnetic recording medium according to claim 1 ,wherein the squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or ...

MAGNETIC TAPE AND MAGNETIC TAPE DEVICE

The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a () plane with respect to a peak intensity of a diffraction peak of a () plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape. 1. A magnetic tape comprising:a non-magnetic support;a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer,wherein a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,the magnetic layer has a servo pattern,the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, anda vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.2. The magnetic tape according to claim 1 ,wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.3. The magnetic tape according to claim 1 ,wherein the total thickness of the non-magnetic ...

MAGNETIC TAPE AND MAGNETIC TAPE DEVICE

Provided are a magnetic tape including: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape. 1. A magnetic tape comprising:a non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,wherein the magnetic layer has a timing-based servo pattern,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, anda vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.2. The magnetic tape according to claim 1 ,wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.3. The magnetic tape according to claim 1 ,wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.4. The magnetic tape ...

MAGNETIC TAPE

Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, the back coating layer includes one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %. 1. A magnetic tape comprising:a non-magnetic support;a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent on one surface side of the non-magnetic support; anda back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00,the back coating layer includes one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide, anda C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of ...

MAGNETIC TAPE

The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, a center line average surface roughness measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°. 1. A magnetic tape comprising:a non-magnetic support;a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent on one surface side of the non-magnetic support; anda back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, anda 1-bromonaphthalene contact angle measured regarding a surface of the back coating layer is 15.0° to 30.0°.2. The magnetic tape according to claim 1 ,wherein the center line average ...

Magnetic recording medium

The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.

Magnetic tape and magnetic tape device

The magnetic tape includes a magnetic layer including ferromagnetic powder and a binding agent, in which a magnetic tape total thickness is equal to or smaller than 5.30 μm, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or lower than 0.30. 1. A magnetic recording medium comprising:a non-magnetic support; anda magnetic layer which is provided on the support and contains ferromagnetic powder and a binder,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0,a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, anda coefficient of friction measured in a base material portion within a surface of the magnetic layer is equal to or lower than 0.30.2. The magnetic recording medium according to claim 1 ,wherein the squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or ...

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a magnetic layer which contains ferromagnetic hexagonal ferrite powder and a binder, in which the magnetic layer contains an abrasive and a fatty acid ester, Int (110)/Int (114) of a crystal structure of the hexagonal ferrite, determined by performing XRD analysis on the magnetic layer by using an In-Plane method, is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, FWHMand FWHMis greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between spacings measured within a surface of the magnetic layer by an optical interference method before and after the heating in a vacuum is greater than 0 nm and equal to or smaller than 8.0 nm. 1. A magnetic recording medium comprising:a non-magnetic support; anda magnetic layer which is provided on the support and contains ferromagnetic powder and a binder,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive and a fatty acid ester, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0,a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00,a full width at half maximum of a spacing distribution measured within a surface of the magnetic layer by an optical interference method before the magnetic recording medium is heated in a vacuum is greater than 0 nm and equal to or smaller than 7.0 nm,a full width at half maximum of a spacing ...

MAGNETIC TAPE

The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the hack coating layer is equal to or smaller than 0.060. 1. A magnetic tape comprising:a non-magnetic support;a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent on one surface side of the non-magnetic support; anda back coating layer including non-magnetic powder and a binding agent on the other surface sick of the non-magnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and.a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the back coating layer is equal to or smaller than 0.060.2. The magnetic tape ...

MAGNETIC TAPE

Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm. 1. A magnetic tape comprising:a non-magnetic support;a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent on one surface side of the non-magnetic support; anda back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00,the back coating layer includes fatty acid ester,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before performing a vacuum heating with respect ...

Method of producing magnetic powder and method of producing magnetic recording medium

[Solving Means] A method of producing a magnetic powder includes: coating a surface of each of silica-coated precursor particles with at least one type of coating agent of a metal chloride or a sulfate; and firing the precursor particles coated with the coating agent.

HEAT-ASSISTED MAGNETIC RECORDING (HAMR) HEAD WITH TAPERED MAIN POLE AND HEAT SINK MATERIAL ADJACENT THE POLE

A heat-assisted magnetic recording (HAMR) head for recording data in data tracks of a HAMR disk has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole formed of two layers. The first main pole layer has a cross-track width at the slider's gas-bearing surface (GBS) that tapers down in the direction towards the NFT where the optical spot is formed. The second main pole layer is located away from the NFT and has a substantially wider cross-track width than the first main pole layer so as to provide sufficient magnetic field for writing. Layers of heat sink material are located on the sloped cross-track sides of the tapered first main pole layer to reduce the temperature and thus the likelihood of oxidation of the main pole layers. 1. A heat-assisted magnetic recording (HAMR) head for writing to a magnetic recording layer comprising:a head carrier having a recording-layer-facing surface with an along-the-track axis and a cross-track axis substantially orthogonal to the along-the-track axis;a main pole on a surface substantially orthogonal to the recording-layer-facing surface, the main pole comprising a first layer and a second layer in contact with the first layer, the first layer tapering in an along-the-track direction from the second layer, the first layer having a tapered end at the recording-layer-facing surface;a near-field transducer (NFT) layer on the head carrier oriented substantially parallel to the first layer, the NFT layer having an output tip at the recording-layer-facing surface aligned with the first layer tapered end in the along-the-track direction;heat sink material adjacent the cross-track sides of the tapered first layer, wherein the heat sink material is spaced apart from the NFT; anda diffusion layer between the heat sink material and the cross-track sides of the tapered first layer, the diffusion layer comprising a material selected from In, Co, Indium oxide, and TiN.2. The HAMR head of wherein the heat ...

MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME

The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support, and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; the backcoat layer has a thickness of less than or equal to 0.30 μm and contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a magnetic layer side C—H derived C concentration is greater than or equal to 45 atom %; and a backcoat layer side C—H derived C concentration is greater than or equal to 35 atom %. 1. A magnetic tape ,which comprises a magnetic layer comprising ferromagnetic powder and binder on one surface of a nonmagnetic support, and comprises a backcoat layer comprising nonmagnetic powder and binder on the other surface of the nonmagnetic support,wherein the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;the backcoat layer has a thickness of less than or equal to 0.30 μm and comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape, referred to as a magnetic layer side C—H derived C concentration, is greater than or equal to 45 atom %; anda C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the backcoat layer side of the magnetic tape, referred to as a backcoat layer side C—H derived C concentration, is greater than or ...

MAGNETIC RECORDING MEDIUM

The magnetic recording medium has a nonmagnetic layer satisfying: the ratio of the total area accounted for by voids observed to the area of the observed region falls within a range of 13.0% to 25.0% in a sectional image taken by SEM; R+σr is 58.0 nm or less and R−σr is 21.0 nm or greater when denoting the average value of the diameters of corresponding circles for voids observed in the sectional image as R, denoting the standard deviation of the diameters of the corresponding circles as σr; N+σn is 185 voids/μmor less and N−σn is 120 voids/μmor greater when denoting the average number of voids observed per μmunit area of the observed region in the sectional image as N, denoting the standard deviation of this number as σn; and the thickness of the nonmagnetic layer is 0.20 μm or greater. 1. A magnetic recording medium ,which comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer comprising ferromagnetic powder, binder, and abrasive on the nonmagnetic layer,wherein the nonmagnetic layer satisfies conditions 1 to 4 below:condition 1: a ratio of as total area accounted for by voids observed to an area of a region being observed falls within a range of 13.0% to 25.0% in a sectional image taken by a scanning electron microscope;condition 2: R+σr is less than or equal to 58.0 nm and R−σr is greater than or equal to 21.0 nm when denoting an average value of diameters of corresponding circles for voids observed in the sectional image as R, denoting a standard deviation of the diameters of the corresponding circles as σr, and denoting R and σr in units of nm;{'sup': 2', '2', '2', '2, 'condition 3: N+σn is less than or equal to 185 voids/μmand N−σn is greater than or equal to 120 voids/μmwhen denoting an average number of voids observed per μmunit area of the region being observed in the sectional image as N, denoting a standard deviation of the number as σn, and denoting N and σn in units of voids/μm;'}condition 4 ...

SURFACE-MODIFIED IRON-BASED OXIDE MAGNETIC PARTICLE POWDER, AND METHOD FOR PRODUCING SAME

A surface-modified iron-based oxide magnetic particle powder has good solid-liquid separation property in the production process, has good dispersibility in a coating material for forming a coating-type magnetic recording medium, has good orientation property, and has a small elution amount of a water-soluble alkali metal, and to provide a method for producing the surface-modified iron-based oxide magnetic particle powder. The surface-modified iron-based oxide magnetic particle powder can be obtained by neutralizing a solution containing dissolved therein a trivalent iron ion and an ion of the metal, by which the part of Fe sites is to be substituted, with an alkali aqueous solution, so as to provide a precursor, coating a silicon oxide on the precursor, heating the precursor to provide e-type iron-based oxide magnetic powder, and adhering a hydroxide or a hydrous oxide of one kind or two kinds of Al and Y thereto. 1. A surface-modified iron-based oxide magnetic particle powder comprising iron-based oxide magnetic particle powder containing ε-FeOor ε-FeO , a part of Fe sites of which is substituted by another metal element , having an average particle diameter measured with a transmission electron microscope of 5 nm or more and 30 nm or less , having adhered to a surface thereof a hydroxide or a hydrous oxide of a metal element S forming a precipitate of a hydroxide in an aqueous solution having pH of 7 or more and 12 or less.2. The surface-modified iron-based oxide magnetic particle powder according to claim 1 , wherein the metal element S is one kind or two kinds of Al and Y.3. The surface-modified iron-based oxide magnetic particle powder according to claim 1 , wherein the surface-modified iron-based oxide magnetic particle powder has a molar ratio SIM of 0.02 or more and 0.10 or less claim 1 , wherein M represents a sum of Fe and the substituting metal element contained therein.4. The surface-modified iron-based oxide magnetic particle powder according to claim ...

POLYESTER COMPOSITION, POLYESTER FILM, AND MAGNETIC RECORDING MEDIUM

An object of the present invention is to more conveniently provide a copolyester for a polyester film which exhibits excellent dimensional stability and in particular excellent dimensional stability against environmental changes in, for example, temperature and humidity, and has a small film elongation percentage at 110° C. A copolyester of the present invention comprises: (A) an aromatic dicarboxylic acid component; (B) an alkylene glycol component; and (C1) a dimer acid component and/or (C2) a dimer diol component, wherein the copolyester contains, with reference to a molar number of a total dicarboxylic acid component, 0.5 to 3.5 mol % of the dimer acid component (C1) and/or 0.3 to 5.0 mol % of the dimer diol component (C2). 1. A copolyester comprising:(A) an aromatic dicarboxylic acid component;(B) an alkylene glycol component; and(C1) a dimer acid component and/or (C2) a dimer dial component,wherein the copolyester contains, with reference to a molar number of a total dicarboxylic acid component, 0.5 to 3.5 mol % of the dimer acid component (C1) and/or 0.3 to 5.0 mol % of the dimer diol component (C2).2. The copolyester according to claim 1 , wherein the dimer acid component (C1) and/or the dimer diol component (C2) are/is derived from a mixture of an aliphatic dicarboxylic acid component and/or aliphatic diol component having an average carbon number of 20 to 55.3. The copolyester according to claim 1 , comprising repeating units (I) to (III):{'br': None, 'sup': 'A', '—C(O)—R—C(O)—\u2003\u2003(I)'}{'br': None, 'sup': 'B', '—C(O)—R—C(O)—\u2003\u2003(II)'}{'br': None, 'sup': 'C', '—O—R—O—\u2003\u2003(III)'}{'sup': 'A', 'wherein the repeating unit (I) is the dimer acid component (C1), and Ris an alkylene group which has 31 to 51 carbon atoms, and may contain a cyclo ring and/or a branched chain,'}{'sup': 'B', 'the repeating unit (II) is the aromatic dicarboxylic acid component (A), and Ris a phenylene group or a naphthalenediyl group, and'}{'sup': 'C', 'the ...

MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCING APPARATUS

According to one embodiment, a magnetic recording medium includes a substrate, a magnetic recording layer on the substrate, and a first protective layer of carbon formed on the magnetic recording layer by thermal CVD. 1. A magnetic recording medium comprising:a substrate;a magnetic recording layer on the substrate; anda first protective layer of carbon formed on the magnetic recording layer by thermal CVD.2. The magnetic recording medium of claim 1 , wherein the magnetic recording layer includes an alloy having an L1crystal structure.3. The magnetic recording medium of claim 2 , wherein the alloy having an L1crystal structure is one of an FePt-based alloy claim 2 , an FePd-based alloy claim 2 , and a CoPt-based alloy.4. The magnetic recording medium of claim 1 , further comprising a second protective layer of carbon formed on the first protective layer by a film forming method other than the thermal CVD.5. A magnetic recording/reproducing apparatus comprising:a magnetic recording medium including a substrate, a magnetic recording layer formed on the substrate, and a first protective layer of carbon formed on the magnetic recording layer by thermal CVD; anda magnetic head.6. The magnetic recording/reproducing apparatus of claim 5 , wherein the magnetic recording layer includes an alloy having an L1crystal structure.7. The magnetic recording/reproducing apparatus of claim 6 , wherein the alloy having an L1crystal structure is one of an FePt-based alloy claim 6 , an FePd-based alloy claim 6 , and a CoPt-based alloy.8. The magnetic recording/reproducing apparatus of claim 5 , further comprising a second protective layer of carbon formed on the first protective layer by a film forming method other than the thermal CVD.9. A method of manufacturing a magnetic recording medium comprising:forming a magnetic recording layer on a substrate; andforming a first protective layer of carbon on the magnetic recording layer by thermal CVD.10. The method of claim 9 , wherein the ...

APPARATUS AND METHOD FOR DYNAMIC MULTIPLE ACTUATOR DRIVE DATA ACCESS

An apparatus and method for dynamic multiple actuator drive data access are disclosed. A particular embodiment includes: receiving a data transfer request including at least one data package; determining a type of the data transfer request; partitioning the data package into a plurality of data segments, if the data transfer request is a parallel data mode request; assigning one or more actuator drivers and one or more actuator controllers for the data transfer request; initiating a data transfer to or from the data storage medium using one or more of the plurality of actuators corresponding to the one or more assigned actuator controllers; storing or retrieving an individual data package of the data transfer request to or from the data storage medium wherein the entire data package is wholly accessible to a single actuator, if the data transfer request is a random data mode request; and storing or retrieving an individual data segment of the data transfer request to or from the data storage medium wherein the data package is accessible to the plurality of actuators, if the request is a parallel data mode request. 1. A data storage system comprising:a data storage medium having a disk with encoded data;a plurality of actuators for accessing data stored on the data storage medium, the plurality of actuators each being mounted on a different shaft at different locations around a surface of the data storage medium, the different locations being different angular positions relative to the center of the data storage medium, the different locations not being concentric; and receive a data transfer request including at least one data package;', 'determine a type of the data transfer request;', 'partition the data package into a plurality of data segments, if the data transfer request is a parallel data mode request;', 'assign one or more actuator drivers and one or more actuator controllers for the data transfer request;', 'initiate a data transfer to or from the data ...

MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS

The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape. 1. A magnetic tape comprising:a non-magnetic support;a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; anda back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support,wherein an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, andan isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0.2. The magnetic tape according to claim 1 ,wherein the isoelectric point of a surface zeta potential of the magnetic layer is 2.5 to 3.8.3. The magnetic tape according to claim 1 ,wherein the isoelectric point of a surface zeta potential of the back coating aver is 2.0 to 3.0.4. The magnetic tape according to claim 1 ,wherein the binding agent of the magnetic layer is a binding agent including an acidic group.5. The magnetic tape according to claim 4 ,wherein the acidic group includes at least one kind of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.6. The magnetic tape according to claim 2 ,wherein the binding agent of the magnetic layer is a binding agent including an acidic group.7. The magnetic tape according to claim 6 ,wherein the acidic group includes at least one kind of acidic group selected from the ...

Non-magnetic substrate for magnetic disk, and magnetic disk

A non-magnetic substrate for a magnetic disk includes a substrate main body having two opposing main surfaces, and a metal film that is provided on the main surfaces and is made of a material having a loss factor of 0.01 or more. The non-magnetic substrate has a thickness (T+D) of 0.700 mm or less, the thickness (T+D) being the sum of a thickness T of the substrate main body and a thickness D of the metal film, and a ratio D/T of the thickness D of the metal film to the thickness T of the substrate main body is 0.025 or more.

Magnetic devices with variable overcoats

A magnetic device including: a magnetic reader; a magnetic writer; and a variable overcoat, the variable overcoat positioned over at least the magnetic reader and writer, the variable overcoat having an overcoat layer, the overcoat layer having a substantially constant thickness and material; and at least one disparate overcoat portion, the disparate overcoat portion having a different thickness, a different material, or both, than the overcoat layer.

SUSPENSION ADJACENT-CONDUCTORS DIFFERENTIAL-SIGNAL-COUPLING ATTENUATION STRUCTURES

Disclosed herein are suspension assembly structures for data storage devices that include physical or virtual crossovers of the pairs of differential signal traces to improve immunity to crosstalk and other interference. In an embodiment, the suspension assembly structure comprises a first trace for carrying a first component of a current to a differential transducer on a slider, a second trace for carrying a second component of the current to the differential transducer on the slider, and third and fourth traces for providing a differential write current to a writer of the data storage device, wherein the first trace physically crosses over the second trace at a first distance from a tail of the suspension assembly structure. 2. The suspension assembly structure recited in claim 1 , wherein the first trace also physically crosses over the second trace at a seventh distance from the tail of the suspension assembly structure.3. The suspension assembly structure recited in claim 1 , wherein:the differential transducer is a spin-torque oscillator (STO), andthe current is a STO bias current.4. The suspension assembly structure recited in claim 3 , wherein the STO bias current comprises an AC component.5. The suspension assembly structure recited in claim 1 , wherein:the differential transducer is a read sensor, andthe current is a read sensor current.6. The suspension assembly structure recited in claim 1 , wherein:the differential transducer is an embedded contact sensor or a thermal fly-height control element.7. (canceled)8. The suspension assembly structure recited in claim 1 , wherein:the first and second distances are substantially equal, andthe third and fourth distances are substantially equal.9. The suspension assembly structure recited in claim 1 , wherein the first and second distances are less than the third and fourth distances.10. The suspension assembly structure recited in claim 1 , wherein:a length of the first trace is less than a length of the fifth ...

METHOD OF MANUFACTURING MAGNETIC RECORDING HEAD

According to one embodiment, a method of manufacturing a magnetic recording head includes forming a microwave oscillator to cover a main pole and a side shield and also to cross at least a part of a side gap between the main pole and the side shield, and lapping the main pole, the side shield and the microwave oscillator in a height direction while monitoring an electric resistance between the main pole and the side shield. 1. A method of manufacturing a magnetic recording head which comprises a main pole configured to apply a recording magnetic field , a write shield opposing the main pole with a write gap between the main pole and the write shield , a side shield disposed on a lateral side of the main pole in a width direction thereof with a side gap between the main pole and the side shield , and a microwave oscillator provided between the main pole and the write shield within the write gap , the method comprising:forming the microwave oscillator to cover the main pole and the side shield and also to cross at least a part of the side gap; andlapping the main pole, the side shield and the microwave oscillator in a height direction while monitoring an electric resistance between the main pole and the side shield.2. The method of claim 1 , wherein the lapping is stopped when a predetermined time elapses from a time when the electric resistance exceeds a predetermined value or the electric resistance exceeds a predetermined value.3. The method of claim 2 , wherein the microwave oscillator is formed in a direction parallel to the height direction of the main pole.4. The method of claim 2 , wherein the microwave oscillator is formed in a direction inclined to the height direction of the main pole.5. The method of claim 3 , wherein the main pole comprises a side surface inclined to the height direction of the main pole claim 3 , and the side shield comprises a side surface inclined to oppose the side surface of the main pole via the side gap claim 3 , andthe microwave ...

DATA STORAGE DEVICE COMPENSATING FOR HEAD/TAPE WEAR

A data storage device is disclosed comprising at least one head configured to access a magnetic tape. A plurality of access commands are stored in a command queue, and a wear value is generated for each access command in the command queue, wherein the wear value represents a level of wear on the head or magnetic tape associated with executing the access command. An execution order for the access commands is generated based on the wear values, and at least one of the access commands is executed based on the execution order.

MAGNETIC TAPE, ITS CLEANING METHOD, AND OPTICAL SERVOTRACK FORMING/CLEANING APPARATUS

A magnetic tape which comprises a nonmagnetic support, a magnetic layer which is formed on one surface of the nonmagnetic support, and a backcoat layer which comprises a binder and nonmagnetic powder containing carbon black as a component and which is formed on the other surface of the nonmagnetic support, having pits for optical servo formed thereon, characterized in that the average of the reflectance on the flat portion of the backcoat layer is 8.5% or higher, and that the maximum rate of fluctuation of the reflectance on the flat portion, depending on a position of the magnetic tape: 1. A magnetic tape comprising a nonmagnetic support , a magnetic layer which is formed on one surface of the nonmagnetic support , and a backcoat layer which comprises a binder and nonmagnetic powder containing carbon black as a component , which is formed on the other surface of the nonmagnetic support , and which has pits for optical servo formed thereon , whereina content of the nonmagnetic powder in the backcoat layer is from 50 wt. % to 60 wt. % based on the total weight of the nonmagnetic powder and the binder in the backcoat layer;an average surface roughness Ra of a flat portion of the backcoat layer, which is measured with an atomic force microscope, is 30 nm or less; andan average of reflection on a flat portion of the backcoat layer is from 8.5% to 14.9%.2. The magnetic tape according to claim 1 , wherein a maximum rate of fluctuation of the reflectance on the flat portion of the backcoat layer depending on a position of the magnetic tape claim 1 , which is defined by the following equation claim 1 , is from 2.8% to 10%:{'br': None, '[Maximum of absolute value of (Reflectance−Average of reflectance)]×100/(Average of reflectance).'}3. The magnetic tape according to claim 1 , wherein a half width of fluctuation of the surface roughness Ra claim 1 , depending on a site of the magnetic tape claim 1 , is 5 nm or less. This application is a Divisional of co-pending application ...

FILLED-GAP MAGNETIC RECORDING HEAD AND METHOD OF MAKING

A magnetic head, according to one embodiment, includes a rowbar substrate having a tape support surface and a gap surface at a substrate edge. A closure is positioned opposite the gap surface of the rowbar substrate, the closure forming a portion of the tape support surface. A recessed gap region is interposed between the gap surface of the rowbar substrate and the closure, the recessed gap region having a recessed gap profile that extends between the gap surface of the rowbar substrate and the closure, the recessed gap region having a transducer row with at least one magnetic sensor on the gap surface of the rowbar substrate. An insulation layer is positioned over the recessed gap profile of the recessed gap region. 1. A magnetic head , comprising:a rowbar substrate having a tape support surface and a gap surface at a substrate edge;a closure opposite the gap surface of the rowbar substrate, said closure forming a portion of the tape support surface;a recessed gap region interposed between the gap surface of the rowbar substrate and the closure, the recessed gap region having a recessed gap profile that extends between the gap surface of the rowbar substrate and the closure, the recessed gap region having a transducer row with at least one magnetic sensor on the gap surface of the rowbar substrate; andan insulation layer over the recessed gap profile of the recessed gap region.2. The magnetic head recited in claim 1 , wherein the recessed gap profile is recessed in the range of 10-50 nm from the tape support surface of the rowbar substrate and the tape support surface of the closure.3. The magnetic head recited in claim 2 , wherein the insulation layer has a thickness in the range of 4-20 nm.4. The magnetic head recited in claim 2 , wherein the insulation layer has a thickness approximately equal to the thickness of the recession of the recessed gap profile from the tape support surface.5. The magnetic head recited in claim 1 , wherein the insulation layer has a ...

MAGNETIC TAPE DEVICE, MAGNETIC REPRODUCING METHOD, AND HEAD TRACKING SERVO METHOD

Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, and ΔSFD (=SFD−SFD) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFDbeing SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFDbeing SFD measured at a temperature of −190° C. 1. A magnetic tape device comprising:a magnetic tape; anda reproducing head,wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, and {'br': None, 'i': SFD=SFD', '−SFD, 'sub': 25° C.', '−190° C., 'Δ\u2003\u2003Expression 1'}, 'ΔSFD in a longitudinal direction of the magnetic tape calculated by Expression 1 is equal to or smaller than 0.50,'}{'sub': 25° C.', '−190° C., 'in Expression 1, the SFDis a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFDis a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of −190° C.'}2. A magnetic ...

TAPE CARTRIDGE HAVING TAPE MEDIA HAVING SYNERGISTIC MAGNETIC RECORDING LAYER AND UNDERLAYER

A tape cartridge, according to one approach, includes a housing, and a magnetic recording tape at least partially stored in the housing. The magnetic recording tape including a recording layer having encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer, and a polymeric binder binding the encapsulated nanoparticles. A tape cartridge, according to another approach, includes a housing, and a magnetic recording tape at least partially stored in the housing. The magnetic recording tape include an underlayer having encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. 1. A tape cartridge , comprising:a housing; anda magnetic recording tape at least partially stored in the housing,the magnetic recording tape including a recording layer having encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer, and a polymeric binder binding the encapsulated nanoparticles.2. The tape cartridge as recited in claim 1 , comprising a nonvolatile memory coupled to the housing.3. The tape cartridge as recited in claim 1 , wherein an average diameter of the magnetic nanoparticles is in a range of 2 nanometers to 20 nanometers.4. The tape cartridge as recited in claim 1 , wherein the encapsulating layer is a layer selected from the group consisting of: a polyaromatic film claim 1 , and a graphite-like dominated continuous film.5. The tape cartridge as recited in claim 1 , wherein the polymeric binder is an acrylic polymer.6. The tape cartridge as recited in claim 1 , wherein an average thickness of the recording layer is less than 0.2 microns.7. The tape cartridge as recited in claim 1 , wherein no wear particles are present in the magnetic recording tape.8. A tape cartridge claim 1 , comprising:a housing; anda magnetic recording tape at least partially stored in the housing,the ...

Spin Transfer Torque Oscillator (STO) with Spin Torque Injection to a Flux Generating Layer (FGL) from Two Sides

A spin torque reversal assisted magnetic recording (STRAMR) structure is disclosed wherein a spin torque oscillator (STO) is formed in the write gap (WG) and generates one or both of a radio frequency (RF) field on a magnetic bit to lower the required write field during a write process, and a spin torque on a field generation layer (FGL) in the STO that flips a FGL magnetization to a direction opposing the WG field thereby increasing reluctance in the WG and causing larger write field output from the main pole (MP). The FGL is between two spin preserving layers that each conduct spin polarized current from an adjoining spin polarization (SP) layer. Current is applied from the MP and trailing shield to the SP layers, and returns to a direct current source through a lead from the FGL. STO sidewalls are self-aligned to a MP tip upper portion.

MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

The magnetic tape includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a change amount of a loss tangent tan δ at a measurement temperature in a range of 50° C. to 100° C. before and after heating at 70° C. for 10 hours is 0.000 or more and 0.012 or less. 1. A magnetic tape comprising:a non-magnetic support; anda magnetic layer including ferromagnetic powder,wherein a change amount Δ1 of a loss tangent tan δ at a measurement temperature in a range of 50° C. to 100° C. before and after heating at 70° C. for 10 hours is 0.000 or more and 0.012 or less.2. The magnetic tape according to claim 1 ,wherein the magnetic tape has the magnetic layer on one surface side of the non-magnetic support and has a back coating layer including non-magnetic powder on the other surface side, and {'br': None, 'i': =Δa×[Da/', 'Da+Db', +Δb×[Db/', 'Da+Db, 'Δ2()()]'}, 'a change amount Δ2 obtained by the following formula is 0.000 or more and 0.020 or less,'}in the formula, Da is a thickness of a portion on the magnetic layer side on the non-magnetic support, Δa is a change amount of a loss tangent tan δ of the portion on the magnetic layer side at a measurement temperature in a range of 50° C. to 100° C. before and after the heating, Db is a thickness of a portion on the back coating layer side on the non-magnetic support, and Δb is a change amount of a loss tangent tan δ of the portion on the back coating layer side at a measurement temperature in a range of 50° C. to 100° C. before and after the heating.3. The magnetic tape according to claim 2 ,wherein the thickness Da of the portion on the magnetic layer side is 0.20 μm or more and 0.50 μm or less, andthe thickness Db of the portion on the back coating layer side is 0.20 μm or more and 1.50 μm or less.4. The magnetic tape according to claim 2 ,wherein the thickness Da of the portion on the magnetic layer side is 0.20 μm or more and 1.00 μm or less, andthe thickness Db of the portion on the back ...

PROCESS FOR FORMING MAGNETIC RECORDING LAYER FOR TAPE MEDIA

A method, in one approach, includes forming a magnetic recording layer having: encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer, and a polymeric binder binding the encapsulated nanoparticles. 1. A method , comprising: encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer, and', 'a polymeric binder binding the encapsulated nanoparticles., 'forming a magnetic recording layer having2. The method as recited in claim 1 , wherein forming the recording layer includes spray coating a mixture of the unencapsulated magnetic nanoparticles claim 1 , an aromatic polymer claim 1 , and the polymeric binder onto a structure.3. The method as recited in claim 1 , wherein forming the recording layer includes heating the magnetic nanoparticles and an aromatic polymer to a temperature of at least 200 degrees Celsius; mixing the polymeric binder with the heated magnetic nanoparticles claim 1 , the aromatic polymer claim 1 , and a solvent to form a mixture; applying the mixture onto a structure; at least partially drying the applied mixture; and radiating the at least partially dried applied mixture for causing crosslinking of the polymeric binder.4. The method as recited in claim 3 , wherein the polymeric binder includes an acrylic terminated polyester.5. The method as recited in claim 1 , wherein forming the recording layer includes radiating a mixture comprising the magnetic nanoparticles and an aromatic polymer for causing the aromatic polymer to crosslink claim 1 , thereby forming the encapsulating layer around the magnetic nanoparticles.6. (canceled)7. (canceled)8. The method as recited in claim 1 , wherein an average diameter of the magnetic nanoparticles is in a range of 2 nanometers to 20 nanometers.9. The method as recited in claim 1 , wherein the encapsulating layer is a layer selected from the group consisting of: a polyaromatic film claim 1 , and graphite-like ...

UNDERLAYER FORMULATION FOR TAPE MEDIA

In one general approach, a product includes an underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. In another general approach, a product includes an electrically conductive underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. The magnetic nanoparticles have an average magnetic field strength of less than 200 Oersted (Oe). An average concentration of the encapsulated nanoparticles in the underlayer is at least 35 vol %. 1. A product , comprising: encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and', 'a polymeric binder binding the encapsulated nanoparticles; and, 'an underlayer of a magnetic recording medium, the underlayer havinga magnetic recording layer formed above the underlayer.2. The product as recited in claim 1 , wherein the magnetic nanoparticles have an average magnetic field strength of less than 200 Oersted (Oe).3. The product as recited in claim 1 , wherein an average concentration of the encapsulated nanoparticles in the underlayer is at least 35 vol %.4. The product as recited in claim 1 , wherein the underlayer is characterized as having an onset glass transition temperature of at least 35° centigrade in a tensile storage modulus (E′) vs. temperature plot.5. The product as recited in claim 1 , wherein the underlayer is electrically conductive.6. The product as recited in claim 1 , wherein the magnetic nanoparticles include chromium oxide.7. The product as recited in claim 1 , wherein an average diameter of the magnetic nanoparticles ...

PROCESS FOR FORMING UNDERLAYER FOR TAPE MEDIA

A method, according to one approach, includes forming an underlayer of a magnetic recording medium. The underlayer includes encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A method, according to another approach, includes mixing encapsulated nanoparticles with a polymeric binder and a solvent to form a mixture, the encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer. The mixture is applied onto a structure. The applied mixture is at least partially dried and cured. 1. A method , comprising: encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and', 'a polymeric binder binding the encapsulated nanoparticles., 'forming an underlayer of a magnetic recording medium, the underlayer comprising2. The method as recited in claim 1 , wherein forming the underlayer includes spray coating a mixture of the magnetic nanoparticles claim 1 , aromatic polymer claim 1 , and polymeric binder onto a structure.3. The method as recited in claim 1 , wherein forming the underlayer includes mixing the polymeric binder with the encapsulated nanoparticles and a solvent to form a mixture; applying the mixture onto a structure; at least partially drying the applied mixture; and radiating the at least partially dried applied mixture for causing crosslinking of the polymeric binder.4. The method as recited in claim 3 , wherein the mixing includes ultrasonically dispersing the encapsulated nanoparticles into the polymeric binder.5. The method as recited in claim 3 , wherein the polymeric binder collapses onto the encapsulated nanoparticles as the solvent is removed during the drying.6. The method as recited in claim 3 , comprising forming a magnetic recording layer on the underlayer after the radiating.7. The method as recited in claim 6 , wherein the recording layer is ...

TAPE MEDIA HAVING SYNERGISTIC MAGNETIC RECORDING LAYER AND UNDERLAYER

A product, according to one approach, includes an underlayer and a magnetic recording layer formed above the underlayer. The underlayer includes first encapsulated nanoparticles each comprising a first magnetic nanoparticle encapsulated by a first aromatic polymer, and a first polymeric binder binding the first encapsulated nanoparticles. The recording layer includes second encapsulated nanoparticles each comprising a second magnetic nanoparticle encapsulated by an encapsulating layer, and a second polymeric binder binding the second encapsulated nanoparticles. 1. A product , comprising: first encapsulated nanoparticles each comprising a first magnetic nanoparticle encapsulated by a first aromatic polymer, and', 'a first polymeric binder binding the first encapsulated nanoparticles; and, 'an underlayer comprising second encapsulated nanoparticles each comprising a second magnetic nanoparticle encapsulated by an encapsulating layer, and', 'a second polymeric binder binding the second encapsulated nanoparticles., 'a magnetic recording layer formed above the underlayer, the recording layer comprising2. The product as recited in claim 1 , wherein the first magnetic nanoparticles have an average magnetic field strength of less than 200 Oersted (Oe).3. The product as recited in claim 1 , wherein an average concentration of the first encapsulated nanoparticles in the underlayer is at least 35 vol %.4. The product as recited in claim 1 , wherein the underlayer is characterized as having an onset glass transition temperature of at least 35° centigrade in a tensile storage modulus (E′) vs. temperature plot.5. The product as recited in claim 1 , wherein the underlayer is electrically conductive.6. The product as recited in claim 1 , wherein the first magnetic nanoparticles include chromium oxide.7215. The product as recited in claim 1 , wherein an average diameter of the first magnetic nanoparticles is in a range of nanometers to nanometers.8. The product as recited in claim 1 ...

MAGNETIC ADHESION LAYER AND METHOD OF FORMING SAME

A device having an air bearing surface and a method of forming the device are disclosed. The device can include a writer portion including a surface at the air bearing surface of the device, a magnetic adhesion layer disposed proximate at least a portion of the surface of the writer portion, and an overcoat disposed proximate at least a portion of the magnetic adhesion layer such that the magnetic adhesion layer is between the at least a portion of the surface of the writer portion and the overcoat. 1. A device having an air bearing surface , the device comprising:a writer portion comprising a surface at the air bearing surface of the device;a magnetic adhesion layer disposed proximate at least a portion of the surface of the writer portion; andan overcoat disposed proximate at least a portion of the magnetic adhesion layer such that the magnetic adhesion layer is between the at least a portion of the surface of the writer portion and the overcoat.2. The device of claim 1 , wherein the magnetic adhesion layer is disposed on substantially all of the surface of the writer portion.3. The device of further comprising a reader portion comprising a surface at the air bearing surface claim 1 , wherein the overcoat is also disposed proximate at least a portion of the surface of the reader portion.4. The device of claim 1 , wherein the magnetic adhesion layer comprises a thickness of at least about 4 angstroms and no greater than about 12 angstroms.5. The device of claim 1 , wherein the magnetic adhesion layer comprises a material having a magnetic moment of at least about 0.1 T and no greater than about 2.4 T.6. The device of claim 1 , wherein the overcoat comprises a material that is electrically insulating.7. The device of claim 1 , further comprising a near field transducer.8. The device of claim 7 , wherein the overcoat comprises a material that has a refractive index at 830 nm of at least about 2.09.9. The device of claim 7 , wherein the overcoat comprises a material ...

FLUORINE-CONTAINING ETHER COMPOUND, LUBRICANT FOR MAGNETIC RECORDING MEDIA, AND MAGNETIC RECORDING MEDIUM

A fluorine-containing ether compound represented by R—R—CH—R—CH—R—Ris provided. (Ris a perfluoropolyether chain; Rand Rare each independently any one of an alkyl group that may have a substituent, an organic group having at least one double bond or at least one triple bond, and a hydrogen atom; and —R—CH—Ris represented by Formula (2), and R—CH—R— is represented by Formula (3)) 2. The fluorine-containing ether compound according to claim 1 ,wherein the alkyl group that may have a substituent is an alkyl group having 1 to 6 carbon atoms, wherein the alkyl group includes a hydroxyl group or a cyano group.3. The fluorine-containing ether compound according to claim 1 ,wherein the organic group having at least one double bond or at least one triple bond is any one of a group containing an aromatic ring, a group containing a heterocyclic ring, an alkenyl group, and an alkynyl group.4. The fluorine-containing ether compound according to claim 1 ,{'sup': '3', 'claim-text': {'br': None, 'sub': 2', '2', '2', 'm', '2', 'n', '2, '—CFO—(CFCFO)—(CFO)—CF—\u2003\u2003(8)'}, 'wherein Rin Formula (1) is represented by any one of Formulas (8) to (10).'} {'br': None, 'sub': 3', '3', '2', 'y', '3, '—CF(CF)—(OCF(CF)CF)—OCF(CF)—\u2003\u2003(9)'}, '(m and n in Formula (8) represent average polymerization degrees, and each represent 0 to 30, with a proviso that m or n is 0.1 or more)'} {'br': None, 'sub': 2', '2', '2', '2', '2', 'z', '2', '2, '—CFCFO—(CFCFCFO)—CFCF—\u2003\u2003(10)'}, '(y in Formula (9) represents an average degree of polymerization and represents 0.1 to 30)'}(in Formula (10), z represents an average degree of polymerization and represents 0.1 to 30).5. The fluorine-containing ether compound according to claim 1 ,wherein a number-average molecular weight thereof is in a range of 500 to 10000.6. A lubricant for magnetic recording media claim 1 , comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the fluorine-containing ether compound according to .'}7. A magnetic ...

MAGNETIC RECORDING MEDIUM

The present disclosure provides where a magnetic recording medium is provided and includes a base; an underlayer that is provided over the base and includes a non-magnetic powder; and a magnetic layer that is provided over the underlayer and includes a magnetic powder and a binder, wherein an average particle volume V of the magnetic powder is 1600 nmor less, an average thickness of the magnetic recording medium is 5.3 μm or less, a thermal stability KV/kT of the magnetic recording medium is 63 or more, and a ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field in a perpendicular direction to a coercive force Hc1 of the magnetic recording medium in the perpendicular direction is 1.98 or less. 1. A magnetic recording medium , comprising:a base;an underlayer that is provided over the base and includes a non-magnetic powder; anda magnetic layer that is provided over the underlayer and includes a magnetic powder anda binder, wherein{'sup': '3', '#text': 'an average particle volume V of the magnetic powder is 1600 nmor less,'}an average thickness of the magnetic recording medium is 5.3 μm or less,{'sub': ['u', 'act', 'B'], '#text': 'a thermal stability KV/kT of the magnetic recording medium is 63 or more, and'}a ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field in a perpendicular direction to a coercive force Hc1 of the magnetic recording medium in the perpendicular direction is 1.98 or less.2. The magnetic recording medium according to claim 1 , wherein the magnetic powder contains hexagonal ferrite.3. The magnetic recording medium according to claim 3 , wherein the hexagonal ferrite contains at least one of Ba claim 3 , Sr claim 3 , or Ca.4. The magnetic recording medium according to claim 1 , wherein a signal attenuation amount SD of the magnetic recording medium at 100 seconds after recording satisfies the following relationship: −0. ...

METHOD FOR PRODUCING HARD DISK SUBSTRATE

An object of the present invention is to obtain a hard disk substrate that can have a smooth surface of a plating film through electroless NiP plating and does not have deteriorated corrosion resistance against acid solutions. A method for producing a hard disk substrate of the present invention includes a first plating step of immersing a substrate in a first electroless NiP plating bath containing an additive with leveling action, thereby forming a lower layer of the electroless NiP plating film on a surface of the substrate, the lower layer having smaller average surface roughness than the surface; and a second plating step of immersing the substrate that has the lower layer of the electroless NiP plating film formed thereon through the first plating step in a second electroless NiP plating bath, thereby forming an upper layer of the electroless NiP plating film, the upper layer having corrosion resistance against acid solutions. Exposure of the lower layer to the atmosphere is suppressed in the period during transition from the first plating step to the second plating step. 1. A method for producing a hard disk substrate with an electroless NiP plating film , comprising:a first plating step of immersing a substrate in a first electroless NiP plating bath containing an additive with leveling action, thereby forming a lower layer of the electroless NiP plating film on a surface of the substrate, the lower layer having smaller average surface roughness than the surface; anda second plating step of immersing the substrate that has the lower layer of the electroless NiP plating film formed thereon through the first plating step in a second electroless NiP plating bath, thereby forming an upper layer of the electroless NiP plating film, the upper layer having corrosion resistance against acid solutions,wherein exposure of the lower layer to the atmosphere is suppressed in a period during transition from the first plating step to the second plating step.2. The method ...

COMPOSITION FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM

An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule. 1. A composition , which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.2. The composition according to claim 1 , wherein the polyhydroxyl compound comprises one or more aromatic carbon rings onto which a hydroxyl group has been directly substituted.3. The composition according to claim 1 , wherein the polyhydroxyl compound comprises two or more aromatic carbon rings per molecule.4. The composition according to claim 1 , wherein the polyhydroxyl compound comprises two or more aromatic carbon groups per molecule claim 1 , with the aromatic carbon rings being connected by a connecting group.5. The composition according to claim 1 , wherein the aromatic carbon ring comprised in the polyhydroxyl compound is a benzene ring.6. The composition according to claim 1 , wherein a cyclic structure comprised in the polyhydroxyl compound is only one or more aromatic carbon rings.7. The composition according to claim 1 , wherein an average molecular weight of the isocyanate compound ranges from 500 to 15 claim 1 ,000 as a weight average molecular weight of a dibutylamine adduct of the isocyanate compound that has been dibutylaminated with dibutylamine.9. The composition according to claim 1 , wherein the isocyanate compound is a reaction product of the polyhydroxyl compound and the polyisocyanate claim 1 , with a number of moles of the polyisocyanate being 0.8 to 1.5-fold a ...

RECALLING FILES STORED ON A TAPE

The time required for recalling the file is reduced when the file is written in a mounted plurality of tapes in comparison to recalling the file when written in a non-mounted plurality of tapes. In the non-mounted state, criteria does not typically exist in order to recall the written file within the plurality of tapes. Embodiments of the present invention provide systems and methods for recalling files based on criteria which considers: the mounted state of a tape; the type of tape; the type of available tape drive; the number of files included in a tape; and the location of the written file in a tape. 1. A method for recalling a file , comprising:recording, by one or more processors, a file within a plurality of storage media;calculating, by one or more processors, an expected reading time to read the file for each component within the plurality of storage media in which the file is recorded, wherein the expected reading time includes a time required for mounting the component loaded in a drive;identifying, by one or more processors, the component to be used for reading the file, wherein the identified component has the lowest expecting reading time among the plurality of storage media; andconverting, by one or more processors, the file into a stub file based on attributes of the file, wherein the attributes of the file include correspondence information and a location of the file within the plurality of storage media.2. The method of claim 1 , further comprising:dynamically counting, by one or more processors, a number of files and directories stored in the component; andcalculating, by one or more processors, the time required for mounting the component based on the dynamically counted number of files and directories stored in the component.3. The method of claim 1 , wherein calculating the expected reading time claim 1 , further comprises:determining, by one or more processors, a time required for loading a component in the drive.4. The method of claim 3 , ...

RECALLING FILES STORED ON A TAPE

The time required for recalling the file is reduced when the file is written in a mounted plurality of tapes in comparison to recalling the file when written in a non-mounted plurality of tapes. In the non-mounted state, criteria does not typically exist in order to recall the written file within the plurality of tapes. Embodiments of the present invention provide systems and methods for recalling files based on criteria which considers: the mounted state of a tape; the type of tape; the type of available tape drive; the number of files included in a tape; and the location of the written file in a tape. 1a non-transitory computer readable storage medium and program instructions stored on the non-transitory computer readable storage medium, the program instructions comprising:program instructions to record a file within a plurality of storage media containing at least one component; 'determining a time required to load each component, characteristics associated with the drive, a first time required for seeking a recording location of the file on each component and for reading the file, a second time required for reading the file based, on a position in a vertical direction of the file and a position in a longitudinal direction of the file;', 'program instructions to calculate an expected reading time to read the file for each component within the plurality of storage media in which the file is recorded, wherein the expected reading time includes a time required for mounting each component loaded in a drive, wherein calculating the expected reading time comprisesresponsive to migrating a file from a primary storage to a component within the plurality of storage media, program instructions to associate the vertical direction of the file and the longitudinal direction of the file on the component with an identification of the component to be utilized for reading the file, wherein the component has a lowest expected reading time among the plurality of storage media; ...

RECALLING FILES STORED ON A TAPE

The time required for recalling the file is reduced when the file is written in a mounted plurality of tapes in comparison to recalling the file when written in a non-mounted plurality of tapes. In the non-mounted state, criteria does not typically exist in order to recall the written file within the plurality of tapes. Embodiments of the present invention provide systems and methods for recalling files based on criteria which considers: the mounted state of a tape; the type of tape; the type of available tape drive; the number of files included in a tape; and the location of the written file in a tape. 1one or more computer processors;one or more non-transitory computer readable storage media; andprogram instructions stored on the one or more non-transitory computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:program instructions to record a file within a plurality of storage media containing at least one component; 'determining a time required to load each component, characteristics associated with the drive, a first time required for seeking a recording location of the file on each component and for reading the file, a second time required for reading the file based, on a position in a vertical direction of the file and a position in a longitudinal direction of the file;', 'program instructions to calculate an expected reading time to read the file for each component within the plurality of storage media in which the file is recorded, wherein the expected reading time includes a time required for mounting each component loaded in a drive, wherein calculating the expected reading time comprisesresponsive to migrating a file from a primary storage to a component within the plurality of storage media, program instructions to associate the vertical direction of the file and the longitudinal direction of the file on the component with an identification of the component to be utilized for ...

MAGNETIC TAPE

The magnetic tape comprises, on one surface of a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder, lubricant, and binder, comprises, on a surface of the nonmagnetic layer, a magnetic layer comprising magnetic powder, lubricant, and binder, and comprises, on the opposite surface of the nonmagnetic support from the surface on which the nonmagnetic layer and magnetic layer are present, a backcoat layer comprising nonmagnetic powder, lubricant, and binder, wherein the contact angle for water of a surface of the magnetic layer ranges from 95° to 100°, and the contact angle for water of a surface of the backcoat layer ranges from 95° to 100°. 1. A magnetic tape , comprising , on one surface of a nonmagnetic support , a nonmagnetic layer comprising nonmagnetic powder , lubricant , and binder;comprising, on a surface of the nonmagnetic layer, a magnetic layer comprising magnetic powder, lubricant, and binder; andcomprising, on an opposite surface of the nonmagnetic support from the surface on which the nonmagnetic layer and magnetic layer are present, a backcoat layer comprising nonmagnetic powder, lubricant, and binder, whereina contact angle for water of a surface of the magnetic layer ranges from 95° to 100°, anda contact angle for water of a surface of the backcoat layer ranges from 95° to 100°.2. The magnetic tape according to claim 1 , wherein a thickness of the nonmagnetic layer ranges from 0.05 to 0.50 μm.3. The magnetic tape according to claim 1 , wherein the magnetic layer comprises:{'b': '1', 'nonmagnetic filler having an average particle size φ1; and'}{'b': 2', '1, 'nonmagnetic filler having an average particle size φ2 smaller than φ1 and a Mohs hardness greater than a Mohs hardness of nonmagnetic filler ;'} {'br': None, '20 nm≦φ1−φ2<50 nm equation 1.'}, 'where φ1 and φ2, each unit of which is nm, satisfy equation 14. The magnetic tape according to claim 2 , wherein the magnetic layer comprises:{'b': '1', 'nonmagnetic filler having an ...

Apparatus and method for controlling multi-actuator hard disk drives

A method for writing data to a dual-actuator disk drive includes providing a multi-actuator disk drive having a first actuator communicating with first disk platters and a second actuator communicating with second disk platters, receiving in a storage controller coupled to the disk drive a data stream including groups of blocks of data to be written to the multi-actuator disk drive, alternately distributing from a disk controller in the disk drive sequential ones of the groups of blocks of data from the data stream to the first actuator and the second actuator as defined by commands from the storage controller, and simultaneously writing from the first actuator to the at least one first disk platter ones of the groups of blocks of data routed to the first actuator and writing from the second actuator to the at least one second disk platter ones of the groups of blocks of data routed to the second actuator.

POLYCRYSTALLINE DIELECTRIC COATING FOR COBALT IRON ALLOY THIN FILMS

In one general embodiment, a method includes performing a reducing operation for reducing a native oxide along a surface of a CoFe layer of a magnetic transducer, after performing the reducing operation, performing an oxidation operation for oxidizing the surface of the CoFe layer, and after performing the oxidation operation, forming a layer of at least partially crystalline alumina on the oxidized surface of the CoFe layer. 1. A method , comprising:performing a reducing operation for reducing a native oxide along a surface of a CoFe layer of a magnetic transducer;after performing the reducing operation, performing an oxidation operation for oxidizing the surface of the CoFe layer; andafter performing the oxidation operation, forming a layer of at least partially crystalline alumina on the oxidized surface of the CoFe layer.2. The method as recited in claim 1 , wherein the oxidized surface of the CoFe layer has CoFe-oxide crystallites therein.3. The method as recited in claim 1 , comprising performing a cleaning operation prior to performing the reducing operation claim 1 , wherein the cleaning operation comprising argon sputtering at an angle of between 5 and 20 degrees from normal to the surface of the CoFe layer for removing carbonaceous contaminants from the surface of the CoFe layer.4. The method as recited in claim 3 , wherein a sputtering energy is in a range of about 250 to about 500 eV.5. The method as recited in claim 1 , wherein the reducing operation comprising argon sputtering at an angle of between 50 and 70 degrees from normal to the surface of the CoFe layer for at least one of removing carbonaceous contaminants and reducing the native oxides on the surface of the CoFe layer.6. The method as recited in claim 5 , wherein a sputtering energy is in a range of about 250 to about 500 eV claim 5 , wherein a duration of the reducing is sufficient to remove substantially all of an amorphous native oxide sublayer from the CoFe layer where “substantially all” ...

MAGNETIC TAPE

Provided is a magnetic tape in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive, a percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region is equal to or greater than 0.02% and less than 0.06%, and a tilt cos 0 of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00. 1. A magnetic tape comprising:a non-magnetic support;a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer,wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,the magnetic layer includes an abrasive,a percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region is equal to or greater than 0.02% and less than 0.06%, anda tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.2. The magnetic tape according to claim 1 ,{'sup': '2', 'wherein a BET specific surface area of the abrasive is in a range of 14 to 40 m/g.'}3. The magnetic tape according to claim 1 ,wherein the abrasive is alumina powder.4. The ...

DISK DEVICE HAVING CONVENTIONAL MAGNETIC RECORDING REGION AND SHINGLED MAGNETIC RECORDING REGION OF DIFFERENT LINEAR DENSITY

According to one embodiment, a magnetic disk device includes a disk, a head which writes data to the disk and reads data from the disk, and a controller which executes, in a first region segmented in a radial direction of the disk, at least one of conventional recording processing which writes a plurality of tracks with a space in between in the radial direction at a first linear recording density and shingled recording processing which writes a plurality of tracks on top of one another in the radial direction at a second linear recording density which is less than or equal to the first linear recording density. 1. A magnetic disk device comprising:a disk;a head which writes data to the disk and reads data from the disk; anda controller which executes, in a first region segmented in a radial direction of the disk, at least one of conventional recording processing which writes a plurality of tracks with a space in between in the radial direction at a first linear recording density and shingled recording processing which writes a plurality of tracks on top of one another in the radial direction at a second linear recording density which is less than or equal to the first linear recording density, whereinthe controller executes the shingled recording processing at the second linear recording density and at a track density at which a product of the second linear recording density and the track density becomes maximized in the first region.2. (canceled)3. The magnetic disk device of claim 1 , wherein a first recording density at which a plurality of tracks are written with a space in between in the radial direction at the first linear recording density in the first region is less than a second recording density at which a plurality of tracks are written on top of one another in the radial direction at the second linear recording density in the first region by 10% to 23%.4. The magnetic disk device of claim 1 , wherein the controller executes the conventional recording ...

ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK, METHOD FOR PRODUCING THE SAME, AND MAGNETIC DISK USING ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK

There are provided: an aluminum alloy substrate for a magnetic disk, the aluminum alloy substrate including an aluminum alloy including 0.4 to 3.0 mass % (hereinafter, “%”) of Fe, less than 0.10% of Si, less than 0.10% of Mg, and the balance of Al and unavoidable impurities, in which an Al—Fe-based intermetallic compound having a longest diameter of 2 μm or more and less than 3 μm is dispersed at a distribution density of 1000 particles/mmor more, and a Mg—Si-based intermetallic compound having a longest diameter of 1 μm or more is dispersed at a distribution density of 1 particle/mmor less; a method for producing the same; and a magnetic disk in which an electroless Ni—P plating treatment layer and a magnetic layer thereon are disposed on a surface of the aluminum alloy substrate for a magnetic disk. 1. An aluminum alloy substrate for a magnetic disk , the aluminum alloy substrate comprising an aluminum alloy comprising 0.4 to 3.0 mass % of Fe , less than 0.10 mass % of Si , less than 0.10 mass % of Mg , and a balance of Al and unavoidable impurities ,{'sup': 2', '2, 'wherein an Al—Fe-based intermetallic compound having a longest diameter of 2 μm or more and less than 3 μm is dispersed at a distribution density of 1000 particles/mmor more, and a Mg—Si-based intermetallic compound having a longest diameter of 1 μm or more is dispersed at a distribution density of 1 particle/mmor less.'}2. The aluminum alloy substrate for a magnetic disk according to claim 1 ,wherein the aluminum alloy further comprises one or more selected from a group consisting of 0.1 to 3.0 mass % of Mn, 0.1 to 3.0 mass % of Ni, 0.005 to 1.000 mass % of Cu, 0.01 to 1.00 mass % of Cr, and 0.01 to 1.00 mass % of Zr.3. The aluminum alloy substrate for a magnetic disk according to claim 1 ,wherein the aluminum alloy further comprises 0.005 to 1.000 mass % of Zn.4. The aluminum alloy substrate for a magnetic disk according to claim 1 ,wherein the aluminum alloy further comprises one or more selected ...

Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, and hard disk drive

An aluminum alloy substrate for a magnetic recording medium, the substrate including: Si in a range of 9.5 to 13.0% by mass or less and Cu in a range of 0.5 to 3.0% by mass or less, wherein a content of Fe is less than 0.01% by mass, the balance is Al, the substrate has a diameter in a range of 53 to 97 mm and a thickness in a range of 0.4 to 0.9 mm or less, and the substrate satisfies at least one of the following conditions (i) and (ii): (i) Sr is contained in the substrate in a range of 0.005% by mass or more and 0.1% by mass or less; and (ii) at least a part of the Si is present as Si particles, and an average particle diameter of particles having a longest diameter of 0.5 μm or more among the Si particles is 2 μm or less.

MAGNETIC RECORDING TAPE AND MAGNETIC RECORDING TAPE CARTRIDGE

An object is to suppress or prevent a dimensional change of a magnetic recording tape. 1. A magnetic recording tape having a layer structure including a magnetic layer , a base layer , and a back layer in this order , whereina reinforcing layer containing a metal or a metal oxide is disposed on either a surface of the base layer on the magnetic layer side or a surface of the base layer on the back layer side, and{'sup': '2', 'a black area in an image obtained by binarizing an optical microscope image of a rectangular region of 64 μm×48 μm of the reinforcing layer is 300 μmor less.'}2. The magnetic recording tape according to claim 1 , wherein the reinforcing layer has a thickness of 500 nm or less.3. The magnetic recording tape according to claim 1 , wherein the reinforcing layer has a Young's modulus of 70 GPa or more.4. The magnetic recording tape according to claim 1 , wherein the Young's modulus of the reinforcing layer is 10 times or more the Young's modulus of the base layer.5. The magnetic recording tape according to claim 1 , wherein the reinforcing layer is a vapor-deposited film layer containing a metal or a metal oxide.6. The magnetic recording tape according to claim 5 , wherein the vapor-deposited film layer has a thickness of 350 nm or less.7. The magnetic recording tape according to claim 1 , whereinthe reinforcing layer is constituted by a vapor-deposited film layer containing a metal or a metal oxide and a metal sputter layer, andthe metal sputter layer is disposed between the base layer and the vapor-deposited film layer.8. The magnetic recording tape according to claim 7 , wherein the metal sputter layer has a thickness of 25 nm or less.9. The magnetic recording tape according to claim 7 , wherein the vapor-deposited film layer has a thickness of 10 nm to 200 nm.10. A magnetic recording tape having a layer structure including a magnetic layer claim 7 , a base layer claim 7 , and a back layer in this order claim 7 , whereina reinforcing layer ...

Magnetic recording medium

The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ε-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.

Pulse-Based Writing for Magnetic Storage Media

The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks. 1. A method comprising:determining that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer;inserting, into the string of data bits, at least one transition to a polarity opposite to the same polarity of the string of data bits; andtransmitting, to the magnetic media writer, the string of data bits including the at least one transition to cause a write head of the magnetic media writer to pulse while writing the magnet corresponding to the string of bits.2. The method of claim 1 , wherein:the at least one transition inserted into the string of data bits includes a first transition and a second transition; anda polarity of the first transition is opposite to a polarity of the second transition.3. The method of claim 2 , further comprising asserting a control signal to the magnetic media writer to mask at least one of the first transition or the second transition inserted into the string of data bits.4. The method of claim 2 , wherein:the first transition and the second transition are consecutive ...

Magnetic recording medium

Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ε iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.