Настройки

Укажите год
-

Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

Подробнее
-

Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

Подробнее

Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Укажите год
Укажите год
Применить Всего найдено 11900. Отображено 100.
05-01-2012 дата публикации

Magnetic recording apparatus and method of testing magnetic recording apparatus

Номер: US20120002316A1
Автор: Kazuto Kashiwagi, Masatoshi Sakurai, Naoki Tagami
Принадлежит: Toshiba Corp

According to one embodiment, there is provided a magnetic recording apparatus including a head slider including read and write elements, and a magnetic recording medium including magnetically recordable recording tracks with a width L 1, a wide land track with a width L 2 larger than the width L 1 of the recording track, and non-recording sections with a width G 1 each provided between adjacent recording tracks. The width L 1 of the recording track is smaller than a bottom read width BRW of the read and write elements, and the width L 2 of the wide land track is larger than the bottom read width BRW of the read and write elements.

Подробнее
Номер записи: 1
16-02-2012 дата публикации

Method for manufacturing porous structure and method for forming pattern

Номер: US20120037594A1
Автор: Koji Asakawa, Toshiro Hiraoka, Yasuyuki Hotta, Yoshihiro Akasaka
Принадлежит: Individual

A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc−No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.

Подробнее
Номер записи: 2
01-03-2012 дата публикации

Perpendicular magnetic recording medium and magentic recording and reproducing apparatus

Номер: US20120050914A1
Автор: Hideaki Takahoshi, Takahiro UKAI
Принадлежит: Showa Denko KK

A perpendicular magnetic recording medium that is excellent in terms of electromagnetic conversion characteristics and can achieve the demand for the recording density growth, and a magnetic recording and reproducing apparatus provided with the perpendicular magnetic recording medium are provided. The perpendicular magnetic recording medium has at least a backing layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer sequentially laminated on a non-magnetic substrate, in which the backing layer includes at least a soft magnetic film having an amorphous structure; the underlayer includes a first underlayer and a second underlayer laminated from the non-magnetic substrate side; the first underlayer is an fcc-structured alloy layer including an fcc-structured element and a bcc-structured element, the second underlayer includes a NiW alloy; and the intermediate layer includes Ru or a Ru alloy.

Подробнее
Номер записи: 3
15-03-2012 дата публикации

Method for manufacturing a perpendicular magnetic data recording media having a pseudo onset layer

Номер: US20120064375A1
Автор: Gunn Choe, Yoshihiro Ikeda
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method for manufacturing a magnetic media for perpendicular magnetic data recording. The method includes depositing a Ru layer in a pure oxygen atmosphere and then further depositing Ru in the presence of oxygen to form a thin pseudo onset layer. The pseudo onset layer can advantageously be depositing in the same deposition chamber and using the same target as that used to deposit the underlying Ru layer. This saves a great deal of manufacturing cost and complexity. The presence of the pseudo onset layer reduces grains size and increases grain separation in a high Ku magnetic layer deposited thereon, thereby increasing signal to noise ratio and decreasing magnetic core width (MCW).

Подробнее
Номер записи: 4
22-03-2012 дата публикации

Perpendicular Magnetic Disc

Номер: US20120070692A1
Автор: Takenori Kajiwara, Tokichiro Sato
Принадлежит: WD Media Singapore Pte Ltd

[Problem] To make a film thinner while keeping a function as an auxiliary recording layer, and improve an SNR and an overwrite characteristic. [Solution] A typical structure of a perpendicular magnetic disk according to the present invention includes, on a base, a granular magnetic layer 160 and an auxiliary recording layer 180 disposed on the granular magnetic layer 160 . The granular magnetic layer 160 has a granular structure in which a grain boundary part is formed with segregation of a non-magnetic substance having an oxide as a main component around magnetic particles having a CoCrPt alloy a main component growing in a columnar shape. The auxiliary recording layer 180 has a CoCrPtRu alloy as a main component, and has a film thickness of 1.5 nm to 4.0 nm.

Подробнее
Номер записи: 5
29-03-2012 дата публикации

System, method and apparatus for shape-engineered islands of exchange spring or exchange coupled composite, bit patterned media

Номер: US20120075747A1
Автор: Dieter K. Weller, Elizabeth A. Dobisz, Michael K. Grobis, Olav Hellwig
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A hard disk drive has a magnetic media disk comprising a substrate having an axis, and an exchange coupled, bit patterned media on the substrate arranged in a plurality of tracks. Each of the tracks has a pattern of islands extending in an axial direction from the disk. Each island comprises a first layer having a first anisotropy and a first layer radial width, and a second layer on the first layer and having a second anisotropy that is lower than the first anisotropy. The second layer radial width is less than the first layer radial width.

Подробнее
Номер записи: 6
05-04-2012 дата публикации

Protective film mainly composed of a tetrahedral amorphous carbon film and a magnetic recording medium having the protective film

Номер: US20120082803A1
Автор: Naruhisa Nagata
Принадлежит: Fuji Electric Co Ltd

A protective film is disclosed that is mainly composed of a tetrahedral amorphous carbon (ta-C film) that is denser than a DLC film formed by a plasma CVD method and containing aggregate particles so reduced as to a necessary and sufficient level, to provide a method of manufacturing such a protective film, and to provide a magnetic recording medium comprising such a protective film. The film is mainly composed of a ta-C film formed by a filtered cathodic arc method using a cathode target of glass state carbon. A magnetic recording medium is disclosed which includes a substrate, a magnetic recording layer, and the protective film mainly composed of a ta-C film.

Подробнее
Номер записи: 7
26-04-2012 дата публикации

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

Номер: US20120100064A1
Автор: Asuka Namai, Kazuyuki Takami, Koutaro Tomita, Shin-ichi Ohkoshi
Принадлежит: University of Tokyo NUC

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.

Подробнее
Номер записи: 8
03-05-2012 дата публикации

Glass substrate for magnetic recording medium and magnetic recording medium

Номер: US20120107647A1
Автор: Kinobu Osakabe, Naomi Matsumoto, Yoichi Hachitani
Принадлежит: Hoya Corp

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.

Подробнее
Номер записи: 9
10-05-2012 дата публикации

Magneto-Elastic Anisotropy Assisted Thin Film Structure

Номер: US20120113541A1
Автор: Timothy J. Klemmer, Wei Peng, Yiao-Tee Hsia
Принадлежит: SEAGATE TECHNOLOGY LLC

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.

Подробнее
Номер записи: 10
07-06-2012 дата публикации

Granular perpendicular media interlayer for a storage device

Номер: US20120141836A1
Автор: Abebe Hailu, Charles Chen, Chunghee Chang, Mark JOHNSON, Shoutao Wang, Weilu Xu, Xiaoguang Ma
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure. The interlayer structure is a stacked structure comprising, in overlying sequence: a chromium alloy situated on the seed layer; and an upper interlayer situated on the chromium alloy.

Подробнее
Номер записи: 11
21-06-2012 дата публикации

Perpendicular magnetic recording media having low medium noise and systems using the same

Номер: US20120154948A1
Автор: Akemi Hirotsune, Ichiro Tamai, Kiwamu Tanahashi, Yotsuo Yahisa
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

In one embodiment, a perpendicular magnetic recording medium includes a substrate, a soft-magnetic underlayer above the substrate, a seed layer above the soft-magnetic underlayer, a first intermediate layer above the seed layer, a second intermediate layer above the first intermediate layer, a recording layer above the second intermediate layer, and a protective layer above the recording layer. The second intermediate layer includes an Ru alloy having an element selected from a group consisting of: Ti in a range from about 20 at. % to about 50 at. %, Nb in a range from about 20 at. % to about 50 at. %, Al in a range from about 20 at. % to about 40 at. %, Ta in a range from about 30 at. % to about 50 at. %, and Si in a range about 20 at. % to about 40 at. %. Other magnetic media and systems using this media are described according to more embodiments.

Подробнее
Номер записи: 12
21-06-2012 дата публикации

Azeotropic and azeotrope-like compositions of methyl perfluoroheptene ethers and heptane and uses thereof

Номер: US20120157362A1
Автор: Jeffrey P. Knapp, Joan Ellen Bartelt
Принадлежит: EI Du Pont de Nemours and Co

The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and heptane. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Подробнее
Номер записи: 13
21-06-2012 дата публикации

Azeotropic and azeotrope-like compositions of methyl perfluoroheptene ethers and ethanol and uses thereof

Номер: US20120157363A1
Автор: Jeffrey P. Knapp, Joan Ellen Bartelt
Принадлежит: EI Du Pont de Nemours and Co

The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and ethanol. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Подробнее
Номер записи: 14
12-07-2012 дата публикации

Glass Substrate for Information Recording Medium, Information Recording Medium, and Method for Producing Glass Substrate for Information Recording Medium

Номер: US20120177949A1
Автор: Hazuki Nakae
Принадлежит: Konica Minolta Opto Inc

For the purpose of providing a glass substrate for an information recording medium capable of acquiring a low GA value, provided is the glass substrate for an information recording medium, wherein a surface of the glass substrate has an arithmetic mean undulation Wa of less than 0.6 nm, and a fine undulation having a root-mean-square height Rq of less than 0.01 nm at a measurement wavelength of 80-120 μm in a radial direction.

Подробнее
Номер записи: 15
19-07-2012 дата публикации

Magnetic recording medium

Номер: US20120183811A1
Автор: Norihito KASADA, Ryota Suzuki, Yasushi Hattori
Принадлежит: Fujifilm Corp

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.

Подробнее
Номер записи: 16
26-07-2012 дата публикации

Glass substrate for magnetic recording medium and its use

Номер: US20120188663A1
Автор: Hideki Isono, Katsuyuki Iwata, Kinobu Osakabe, Mikio Ikenishi, Naomi Matsumoto
Принадлежит: Hoya Corp

An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass with a glass transition temperature of equal to or greater than 600° C., an average coefficient of linear expansion at 100 to 300° C. of equal to or greater than 70×10 −7 /° C., a Young's modulus of equal to or greater than 81 GPa, a specific modulus of elasticity of equal to or greater than 30 MNm/kg, and a fracture toughness value of equal to or greater than 0.9 MPa·m 1/2 .

Подробнее
Номер записи: 17
06-09-2012 дата публикации

Ag ALLOY THERMAL DIFFUSION CONTROL FILM FOR USE IN MAGNETIC RECORDING MEDIUM FOR HEAT-ASSISTED MAGNETIC RECORDING, MAGNETIC RECORDING MEDIUM FOR HEAT-ASSISTED MAGNETIC RECORDING, AND SPUTTERING TARGET

Номер: US20120225323A1
Автор: Junichi Nakai, Yuki Tauchi
Принадлежит: Kobe Steel Ltd

Disclosed is a thermal diffusion control film to be used in a magnetic medium for thermally assisted recording, said thermal diffusion control film maintaining a high heat conductivity, and at the same time, having all of a high thermal diffusivity, a smooth surface roughness, and a high heat resistance. The thermal diffusion control film, i.e., an Ag alloy thermal diffusion control film, is composed of an Ag alloy having Ag as a main component, and satisfies a surface roughness (Ra) of 1.0 nm or less, a heat conductivity of 100 W/(m·K) or more, and a thermal diffusivity of 4.0×10 −5 m 2 /s or more.

Подробнее
Номер записи: 18
04-10-2012 дата публикации

Method for manufacturing magnetic recording medium, and magnetic recording/reproducing apparatus

Номер: US20120250186A1
Автор: Atsushi Hashimoto, Toshikazu IRISAWA
Принадлежит: Showa Denko KK

A method for manufacturing a magnetic recording medium including at least a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer that controls an orientation of an immediate upper layer, and a perpendicular magnetic layer in which a magnetization easy axis is mainly perpendicularly oriented with respect to the non-magnetic substrate so as to be laminated one another on the non-magnetic substrate. The perpendicular magnetic layer includes two or more magnetic layers, and each layer is subjected to a crystal growth such that each crystal grain composing each magnetic layer forms a columnar crystal continuous in a thickness direction together with the crystal grains composing the orientation control layer. The orientation control layer, formed of a Co—Cr alloy, is formed by the reactive sputtering using a mixture of a sputtering gas and nitrogen.

Подробнее
Номер записи: 19
01-11-2012 дата публикации

Lubricant for magnetic disk and magnetic disk

Номер: US20120276417A1
Автор: Katsushi Hamakubo, Koichi Shimokawa
Принадлежит: WD Media Singapore Pte Ltd

A lubricant for a magnetic disk that is excellent in heat resistance and is suitably used in a magnetic disk to be mounted on a magnetic recording device of a thermally assisted magnetic recording system and a magnetic disk provided with a lubricant layer containing this lubricant. The lubricant for a magnetic disk contains a compound where perfluoropolyether groups each having a perfluoropolyether main chain in its structure and a phosphazene ring at an end are linked to each other through a linking group. The linking group is an aliphatic group or a phosphazene ring. In a magnetic disk having at least a magnetic recording layer, a protective layer, and a lubricant layer on a substrate, the lubricant layer contains the lubricant for a magnetic disk.

Подробнее
Номер записи: 20
08-11-2012 дата публикации

Glass substrate for a magnetic disk, magnetic disk and method of manufacturing a magnetic disk

Номер: US20120282493A1
Автор: Kouji KITSUNAI, Takashi Maeda
Принадлежит: Hoya Corp

A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface shape is given as a microwaviness Rq, the difference between the microwavinesses Rq of the regions is 0.02 nm or less or the difference between standard deviations of the microwavinesses Rq of the regions is 0.04 nm or less.

Подробнее
Номер записи: 21
15-11-2012 дата публикации

Perpendicular magnetic recording medium

Номер: US20120288735A1
Автор: Yasuaki Hozumi
Принадлежит: Fuji Electric Co Ltd

This document discloses a perpendicular magnetic recording medium in which the magnetic anisotropy of a magnetic recording layer is raised and the thermal stability of recorded signals is improved without changing the conventional stacked configuration. A perpendicular magnetic recording medium is formed by stacking at least an intermediate layer, a second underlayer, and a magnetic recording layer in this order on a nonmagnetic base. The intermediate layer is either a single layer of Ru or a Ru-based alloy, or a stacked structure of a nonmagnetic alloy film including Co and Cr and a film of Ru or a Ru-based alloy. The second underlayer includes Co in the range from 30 at % to 75 at %, Cr in the range from 20 at % to 60 at %, and W in the range from 0.1 at % to 10 at %, and has a thickness in the range from 0.1 nm to 1.0 nm.

Подробнее
Номер записи: 22
27-12-2012 дата публикации

Glass for use as substrate for information recording medium, substrate for information recording medium and information recording medium, and their production methods

Номер: US20120328907A1
Автор: Kazuo Tachiwana, Kinobu Osakabe, Mikio Ikenishi, Xuelu Zou, Yoichi Hachitani
Принадлежит: Hoya Corp

According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO 2 and Al 2 O 3 , where SiO 2 content is equal to or greater than 50 percent and Al 2 O 3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li 2 O, Na 2 O and K 2 O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 , La 2 O 3 Y 2 O 3 and TiO 2 ; with the molar ratio of the total content of Li 2 O, Na 2 O and K 2 O to the total content of SiO 2 , Al 2 O 3 , ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 , La 2 O 3 , Y 2 O 3 and TiO 2 ((Li 2 O+Na 2 O+K 2 O)/(SiO 2 +Al 2 O 3 +ZrO 2 +HfO 2 +Nb 2 O 5 +Ta 2 O 5 +La 2 O 3 +Y 2 O 3 +TiO 2 )) being equal to or less than 0.28. Further provided are the substrate for information recording medium, information recording medium and their manufacturing methods according to the present invention.

Подробнее
Номер записи: 23
03-01-2013 дата публикации

Writing a reference pattern to bit patterned media

Номер: US20130003215A1
Автор: David Erich Tetzlaff, Puskal P. Pokharel, Rene Johannes Marinus van de Veerdonk
Принадлежит: SEAGATE TECHNOLOGY LLC

A given reference pattern is written on bit patterned media that has an initial reference pattern already disposed thereon. A write phase and frequency is detected based on the initial reference pattern and the given reference pattern is written on the bit patterned media at the detected write phase and frequency.

Подробнее
Номер записи: 24
03-01-2013 дата публикации

Discrete Track Media (DTM) Design and Fabrication for Heat Assisted Magnetic Recording (HAMR)

Номер: US20130003511A1
Автор: Bin Lu, Ganping Ju, Kaizhong Gao, Michael Allen Seigler, Xuhui Jin
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus includes a recording media including a substrate, a plurality of tracks of magnetic material on the substrate, and a non-magnetic material between the tracks; a recording head having an air bearing surface positioned adjacent to the recording media, and including a magnetic pole, an optical transducer, and a near-field transducer, wherein the near-field transducer directs electromagnetic radiation onto tracks to heat portions of the tracks and a magnetic field from the magnetic pole is used to create magnetic transitions in the heated portions of the tracks; and a plasmonic material positioned adjacent to the magnetic material to increase coupling between the electromagnetic radiation and the magnetic material.

Подробнее
Номер записи: 25
10-01-2013 дата публикации

Patterned media with an alternating series of concentric servo zones and overlap zones

Номер: US20130010383A1
Автор: Kei Yasuna, Keiichiro Nonaka, Masahito Kobayashi
Принадлежит: Individual

Embodiments described herein provide for patterned media concentric zones with an alternating series of concentric servo zones and overlap zones. The overlap zones facilitate the writing of servo data between servo zones of different servo frequency. The overlap zones may be dual frequency zones. The dual frequency zones have a first set of overlap patterns with the substantially identical pattern as the bordering lower frequency servo zone and a second set of overlap patterns with the substantially identical pattern as the bordering higher frequency servo zone. A bootstrap zone can be included near the inner diameter to assist initial servo writing. Alternatively the overlap zones are bootstrap zones. Such bootstrap zones have both bootstrap patterns and overlap patterns, the overlap patterns have the substantially identical pattern as a bordering servo zone. Bootstrap patterns only require DC magnetization for servo operability.

Подробнее
Номер записи: 26
14-02-2013 дата публикации

Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied

Номер: US20130040169A1
Автор: Atsuko Morita, Mikio Ikenishi, Xuelu Zou
Принадлежит: Hoya Corp

Disclosed are a glass substrate for an information recording medium, having excellent scratch resistance and a light weight and having high fracture toughness, the glass substrate having a fragility index value, measured in water, of 12 μm −1/2 or less or having a fragility index value, measured in an atmosphere having a dew point of −5° C. or lower, of 7 μm −1/2 or less, or the glass substrate comprising, by mol %, 40 to 75% of SiO 2 , 2 to 45% of B 2 O 3 and/or Al 2 O 3 and 0 to 40% of R′ 2 O in which R′ is at least one member selected from the group consisting of Li, Na and K), wherein the total content of SiO 2 , B 2 O 3 , Al 2 O 3 and R′ 2 O is at least 90 mol %, and a magnetic information recording medium comprising a magnetic recording layer formed on the glass substrate.

Подробнее
Номер записи: 27
21-02-2013 дата публикации

Superoleophobic glass devices and their methods

Номер: US20130044162A1
Автор: Hong Zhao, Kock-Yee Law, Yuanjia Zhang
Принадлежит: Xerox Corp

Various embodiments provide materials and methods for a superoleophobic device, which can include a conformal oleophobic coating disposed on glass pillars and/or stripe-shaped glass structures on a glass substrate to provide the device with a textured superoleophobic surface.

Подробнее
Номер записи: 28
21-03-2013 дата публикации

Planarization Method for Media

Номер: US20130070370A1
Автор: David Shiao-Min Kuo, Gene Gauzner, Justin Jia-Jen Hwu, Koichi Wago, WEI Hu, Yuan Xu
Принадлежит: SEAGATE TECHNOLOGY LLC

A planarization process may planarize a media disk that has data trenches between data features and larger servo trenches between servo features. A filler material layer is deposited on the media disk and provides step coverage of the trenches. The filler material has data recesses over the data trenches and servo recesses over the servo trenches that must be removed to produce a planar media surface. A first planarization process is used to remove the data recesses and a second planarization process is used to remove the servo recesses.

Подробнее
Номер записи: 29
21-03-2013 дата публикации

Granular perpendicular magnetic recording apparatus

Номер: US20130071693A1
Автор: Huan Tang, Jing Gui, John Wang, Raj Thangaraj, Tommy T. Cheung
Принадлежит: SEAGATE TECHNOLOGY LLC

A method of manufacturing a granular perpendicular magnetic recording medium with improved corrosion resistance comprises sequential steps of providing a non-magnetic substrate including a surface; forming a soft magnetic underlayer (SUL) over the surface; post-deposition heating the SUL; forming an intermediate layer stack over the heated SUL; and forming at least one granular, magnetically hard perpendicular magnetic recording layer over the intermediate layer stack. Heating of the SUL prior to formation of the intermediate layer stack results in formation of an intermediate layer stack with a smoother surface and a granular perpendicular recording layer with increased corrosion resistance than when SUL post-deposition heating is not performed.

Подробнее
Номер записи: 30
21-03-2013 дата публикации

Hybrid Grain Boundary Additives in Granular Media

Номер: US20130071695A1
Автор: Ju Ganping, Peng Yingguo
Принадлежит: SEAGATE TECHNOLOGY LLC

Magnetic layers are described that include the use of magnetic grains and non-magnetic grain boundaries with hybrid additives. Hybrid additives include the use of at least two different additives in the composition of the grain boundaries of a magnetic layer in magnetic recording media. The use of hybrid additives in the grain boundaries results in improved recording media. Methods for forming magnetic layers and magnetic recording media with the hybrid additive grain boundaries are also described. 1. An apparatus comprising a substrate , one or more underlayers and a magnetic layer wherein the magnetic layer comprises magnetic grains and grain boundaries comprising hybrid additives , the hybrid additives having two or more different additives ,wherein a first one of the two or more different additives imparts a first property to the magnetic layer and also imparts a second property to the magnetic layer, andwherein a second one of the two or more different additives substantially counteracts the second property that the first one of the two or more different additives imparts to the magnetic layer.2. The apparatus of wherein the magnetic layer comprises FePt or CoPt.3. The apparatus of wherein the hybrid additive materials comprise combinations of two or more additives selected from MgO claim 1 , C claim 1 , BN claim 1 , SiO claim 1 , TiO claim 1 , TaO claim 1 , WO claim 1 , SiN and SiC.4. The apparatus of wherein the percentage of each of the additives in the grain boundary materials is between about 2 percent and about 98 percent.5. The apparatus of wherein the hybrid additives are between about 10 percent and about 70 percent of the volume of the total magnetic layer components.6. The apparatus of wherein the thickness of the magnetic layer is between about 5 nm and about 30 nm.7. The apparatus of wherein the two or more different additives differ from one another in at least one chemical element.8. The apparatus of wherein the first property that the first one ...

Подробнее
Номер записи: 31
04-04-2013 дата публикации

Lubricant layer that provides a stable head-to-disk interface in humid conditions

Номер: US20130083422A1
Автор: Mina Amo, Robert Waltman, Yoshihiko Ooeda, Yuichi Aoki, Yuzuru Shimazaki
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

In one embodiment, a magnetic disk medium includes a nonmagnetic substrate, a magnetic recording layer above the nonmagnetic substrate, a protective layer above the magnetic recording layer, and a lubricant layer above the protective layer, the lubricant layer including a mixture of a compound having one or more cyclophosphazene groups and a lubricant formulated R1-OCH 2 CF 2 CF 2 O(CF 2 CF 2 CF 2 O) m CF 2 CF 2 CH 2 O—R2, wherein R1 and R2 are alkyl chains having at least two hydroxyl groups each, and m is an integer indicating a number of repeating units. According to another embodiment, a magnetic disk medium lubricant includes a mixture of a compound having one or more cyclophosphazene groups and a lubricant formulated as above, such that a magnetic head is provided stable flight above the lubricant layer in conditions having relative humidity of greater than about 40%.

Подробнее
Номер записи: 32
23-05-2013 дата публикации

Medium, method of fabricating a medium, recording system and method of controlling a recording system

Номер: US20130128378A1
Автор: BO LIU, Jianzhong Shi, Weidong Zhou, Zhimin Yuan
Принадлежит: Agency for Science Technology and Research Singapore

A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.

Подробнее
Номер записи: 33
23-05-2013 дата публикации

PERPENDICULARLY MAGNETIZED THIN FILM STRUCTURE AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130130063A1
Автор: CHOI Gyung Min, MIN Byoung Chul, Shin Kyung Ho
Принадлежит: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

A perpendicularly magnetized thin film structure and a method of manufacturing the perpendicularly magnetized thin film structure are provided. The perpendicularly magnetized thin film structure includes i) a base layer, ii) a magnetic layer located on the base layer and having an L1-crystalline structure, and iii) a metal oxide layer located on the magnetic layer. 1. A perpendicularly magnetized thin film structure comprising:a base layer;{'sub': '0', 'a magnetic layer located on the base layer and having an L1-crystalline structure; and'}a metal oxide layer located on the magnetic layer.2. The perpendicularly magnetized thin film structure of claim 1 , wherein the metal oxide layer contains at least one of metal oxide selected from a group of TiO claim 1 , TaO claim 1 , AlO claim 1 , CrO claim 1 , ZrO claim 1 , ZnO claim 1 , CuO claim 1 , and NiO.3. The perpendicularly magnetized thin film structure of claim 2 , wherein the magnetic layer contains a compound having a chemical formula of AB claim 2 , the A is at least one element selected from a group of Fe(iron) claim 2 , Co(cobalt) claim 2 , Ni(nickel) claim 2 , Mn(manganese) or Cr(chromium) claim 2 , the B is at least one element selected from a group of Pt(platinum) claim 2 , Pd(palladium) claim 2 , Ni(nickel) claim 2 , Rh(rhodium) claim 2 , Au(gold) claim 2 , Hg(mercury) or Al(aluminum) claim 2 , and the x is 25 at % to 75 at %.4. The perpendicularly magnetized thin film structure of claim 3 , wherein the x is 40 at % to 60 at %.5. The perpendicularly magnetized thin film structure of claim 1 , wherein the magnetic layer contains boron above 0 and not more than 50 at % and the metal oxide layer contains BO.6. The perpendicularly magnetized thin film structure of claim 1 , further comprising an insulating layer located between the base layer and the magnetic layer.7. The perpendicularly magnetized thin film structure of claim 6 , wherein the insulating layer includes an MgO layer and the thickness of the MgO ...

Подробнее
Номер записи: 34
13-06-2013 дата публикации

Data storage medium surface smoothing method and associated apparatus

Номер: US20130146562A1
Автор: Bruno Marchon, Daryl J. Pocker, Thomas E. Karis, Xing-Cai Guo
Принадлежит: HGST NETHERLANDS BV

A method for smoothing a medium includes depositing a magnetic layer onto a base, depositing an overcoat layer onto an outer surface of the magnetic layer, and burnishing an outer surface of the overcoat layer. Further, the method includes at least one of (i) directing a first ion beam comprised of first energetic ions toward the outer surface of the magnetic layer at a first shallow grazing angle and smoothing the outer surface of the magnetic layer via etching engagement between the first ion beam and the outer surface of the magnetic layer; and (ii) directing a second ion beam comprised of second energetic ions toward the outer surface of the overcoat layer at a second shallow grazing angle and smoothing the outer surface of the overcoat layer via etching engagement between the second angled ion beam and the outer surface of the overcoat layer.

Подробнее
Номер записи: 35
20-06-2013 дата публикации

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

Номер: US20130152822A1
Автор: Kazufumi Omura
Принадлежит: Fujifilm Corp

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.

Подробнее
Номер записи: 36
27-06-2013 дата публикации

Surface Treatment Method to Develope a Durable Wear Resistant Overcoat for Magnetic Recording Systems

Номер: US20130163117A1
Автор: Charanjit Signh Bhatia, Ehsan Rismani-Yazdi, Sujeet Kumar Sinha
Принадлежит: NATIONAL UNIVERSITY OF SINGAPORE

A durable wear-resistant coating consists of an atomically mixed layer on the surface of the head or media which is developed by bombardment of the surface with energetic C ions with optimized parameters. This mixed layer is covered with a hard DLC overcoat. This mixed interlayer is able to strongly bond the overcoat to the head or media substrate and improve the tribological properties of the overcoat. In this method a very thin layer of a carbide former material can be used as an interlayer before bombarding the surface with C ions which provides a composite interlayer containing C and species from interlayer and substrate. This composite interlayer strongly bonds the DLC overact to the ceramic substrate of the head or the metallic substrate of the media. This interlayer by itself is protective enough to protect the head media of the hard drives against wear and corrosion.

Подробнее
Номер записи: 37
27-06-2013 дата публикации

Magnetic head having high-frequency oscillatory elements and disk drive with the same

Номер: US20130163122A1
Автор: Katsuhiko Koui, Kenichiro Yamada, Masaya Ohtake, Masayuki Takagishi, Tomoko Taguchi
Принадлежит: Toshiba Corp

According to one embodiment, a magnetic head includes a main pole configured to apply a perpendicular recording magnetic field to a recording layer of a recording medium, a return pole opposed to the trailing side of the main pole with a write gap therebetween and configured to reflux magnetic flux from the main pole to form a magnetic circuit in conjunction with the main pole, a coil configured to excite magnetic flux in the magnetic circuit includes the main pole and the return pole, a plurality of high-frequency oscillatory elements individually interposed between the main pole and the return pole, includes a plurality of magnetic films different in magnetic resonance frequency, and configured to individually apply high-frequency magnetic fields to the recording medium, and an electrical circuit configured to energize the high-frequency oscillatory elements.

Подробнее
Номер записи: 38
27-06-2013 дата публикации

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

Номер: US20130164563A1
Автор: Kazufumi Omura, Masahiko Mori
Принадлежит: Fujifilm Corp

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.

Подробнее
Номер записи: 39
27-06-2013 дата публикации

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

Номер: US20130164564A1
Автор: MORI Masahiko, OMURA Kazufumi
Принадлежит: FUJIFILM Corporation

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 ...

Подробнее
Номер записи: 40
01-08-2013 дата публикации

Magnetic media and magnetic recording devices using fluorine compounds

Номер: US20130194693A1
Автор: Bruno Marchon, Hiroshi Yoshida, Katsumi Mabuchi, Mina Amo, Qing Dai
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

According to one embodiment, a lubricant includes a perfluoropolyether having a chemical structure of wherein Rf is at least one of —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 — and —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) k CF 2 CF 2 —, with m representing 0 or a positive integer, n representing 0 or a positive integer, and k representing 0 or a positive integer, and wherein R1 to R4 are selected from a group consisting of —H or with at least one of R1 to R4 being

Подробнее
Номер записи: 41
01-08-2013 дата публикации

HEAT-ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND READING APPARATUS

Номер: US20130194901A1
Автор: Fukushima Takayuki, Hashimoto Atsushi, Kanbe Tetsuya
Принадлежит: SHOWA DENKO K.K.

The heat-assisted magnetic recording medium of the present invention has a substrate, an under layer formed on the substrate, and a magnetic layer formed on the under layer, in which the magnetic layer includes an alloy having a L1structure as a principle component, and the under layer is constituted by a first under layer made of an amorphous alloy or an alloy having a microcrystalline structure, a second under layer made of Cr or an alloy which contains Cr as a principle component and has a BCC structure, a third under layer made of a metal or an alloy having a BCC structure with a lattice constant of 2.98 Å or more, and a fourth under layer made of MgO. 1. A heat-assisted magnetic recording medium comprising:a substrate;an under layer formed on the substrate; anda magnetic layer formed on the under layer,{'sub': '0', 'wherein the magnetic layer includes an alloy having a L1structure as a principle component, and'}the under layer is constituted by a first under layer made of an amorphous alloy or an alloy having a microcrystalline structure, a second under layer made of Cr or an alloy which contains Cr as a principle component and has a BCC structure, a third under layer made of a metal or an alloy having a BCC structure with a lattice constant of 2.98 Å or more, and a fourth under layer made of MgO.2. The heat-assisted magnetic recording medium according to claim 1 ,wherein the first under layer is made of a NiTa alloy, a NiTi alloy, a CoTa alloy, a CoTi alloy, a CrTa alloy, a CrTi alloy, a CoCrZr alloy, or a CoCrTa alloy which is non-magnetic or is magnetized at 100 emu/cc or less.3. The heat-assisted magnetic recording medium according to claim 1 ,wherein the second under layer is made of an alloy which contains Cr as a principle component and contains at least one element selected from Ti, V, Mo, W, Ru, and Mn.4. The heat-assisted magnetic recording medium according to claim 1 ,wherein the second under layer is made of an alloy which contains Cr as a principle ...

Подробнее
Номер записи: 42
01-08-2013 дата публикации

PROTECTIVE FILM AND MAGNETIC RECORDING MEDIUM HAVING THE PROTECTIVE FILM

Номер: US20130196177A1
Автор: Kobayashi Ryoji, NAGATA Naruhisa, Suzuki Yoshihisa
Принадлежит: FUJI ELECTRIC CO., LTD.

A protective film for a magnetic recording medium is composed of amorphous carbon containing fluorine and nitrogen, the fluorine and nitrogen being present in a region 0.5 nm deep from a surface of the protective film. A magnetic recording medium includes a substrate; a metal film layer placed on the substrate; and the protective film placed on the metal film layer. A method for producing the protective film for a magnetic recording medium includes providing a stacked body containing a substrate and a metal film layer formed on the substrate; forming the protective film on the stacked body; and plasma-processing the protective film in a fluorine-containing gas and a nitrogen-containing gas. The protective film of the present invention simultaneously accomplishes reduction in film thickness, improvement of durability and corrosion resistance, and improvement of the bonding strength of the surface of the protective film to a lubricating film. 1. A protective film for a magnetic recording medium , comprising amorphous carbon containing fluorine and nitrogen , the fluorine and nitrogen being present in a region 0.5 nm deep from a surface of the protective film.23-. (canceled)4. The protective film according to claim 1 , wherein the protective film has a film thickness of equal to or greater than 1.7 nm but equal to or less than 2.3 nm.5. (canceled)6. The protective film according to claim 1 , wherein the fluorine and nitrogen are each added in an amount of 5 to 20 at. %.7. A magnetic recording medium claim 1 , comprising:a substrate;a metal film layer placed on the substrate; and{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a protective film according to placed on the metal film layer.'}8. The magnetic recording medium according to claim 7 , wherein a lubricating film is placed on the protective film and has a film thickness of equal to or greater than 0.6 nm but equal to or less than 1.0 nm.9. A method for producing a protective film for a magnetic recording ...

Подробнее
Номер записи: 43
15-08-2013 дата публикации

Bit-patterned media with antiferromagnetic shell

Номер: US20130206722A1
Автор: Haiwen Xi, Kaizhong Gao, Song Xue
Принадлежит: SEAGATE TECHNOLOGY LLC

A method of producing bit-patterned media is provided whereby a shell structure is added on a bit-patterned media dot. The shell may be an antiferromagnetic material that will help stabilize the magnetization configuration at the remanent state due to exchange coupling between the dot and its shell. Therefore, this approach also improves the thermal stability of the media dot and helps each individual media dot maintain a single domain state.

Подробнее
Номер записи: 44
15-08-2013 дата публикации

Thermal diffusion control film for use in magnetic recording medium, for heat-assisted magnetic recording, magnetic recording medium, and sputtering target

Номер: US20130209310A1
Автор: Hideo Fujii, Yoko Shida
Принадлежит: Kobe Steel Ltd

A thermal diffusion control film which includes an Ag alloy containing Nd, Bi, and Si. The thermal diffusion control film can be used for a magnetic recording medium for heat-assisted magnetic recording. The thermal diffusion control film has a good heat resistance even after heat hysteresis at about 600° C.

Подробнее
Номер записи: 45
15-08-2013 дата публикации

Perpendicular magnetic recording medium and method of manufacturing same

Номер: US20130209836A1
Автор: Hirohisa Oyama, Sadayuki Watanabe, Satoshi Takahashi, Shunji Takenoiri, Toyoji Ataka, Yasuaki Hozumi
Принадлежит: Fuji Electric Co Ltd

A perpendicular magnetic recording medium exhibits reduced noise and improved performance in such measures as SN ratio, and can realize high magnetic recording densities. In the perpendicular magnetic recording medium, at least a first nonmagnetic intermediate layer, second nonmagnetic intermediate layer, and magnetic recording layer are stacked in order on a nonmagnetic substrate. The first nonmagnetic intermediate layer is formed from a CoCrRuW alloy, and the second nonmagnetic intermediate layer is formed from an Ru-base alloy.

Подробнее
Номер записи: 46
15-08-2013 дата публикации

FLUOROPOLYETHER COMPOUND, LUBRICANT AND MAGNETIC DISK EACH CONTAINING THE SAME

Номер: US20130209837A1
Автор: HATTA Tomomi, KOBAYASHI Nagayoshi, SAGATA Ryosuke, SHIMIZU Tsuyoshi
Принадлежит: MORESCO CORPORATION

A compound of the formula (1), lubricant containing the compound and magnetic disk 2. A compound as defined in wherein x and y are each a real number of 0 to 10 claim 1 , and z is a real number of 1 to 10.4. A lubricant as defined in wherein x and y are each a real number of 0 to 10 claim 3 , and z is a real number of 1 to 10.6. A magnetic disk as defined in wherein x and y are each a real number of 0 to 10 claim 5 , and z is a real number of 1 to 10. The present invention relates to fluoropolyether compounds having an aromatic group and hydroxyl, lubricants containing the compound and magnetic disks having the lubricant applied thereto.With an increase in the recording density of magnetic disks, the distance between the magnetic disk serving as a recording medium and the head for use in recording of information or playback has become almost nil close to contact therebetween. The magnetic disk is provided over the surface thereof with a carbon protective film or lubricant film for the purpose of diminishing abrasion due to the contact or sliding of the head thereon or preventing contamination of the disk surface.The carbon protective film is produced generally by the sputtering process or CVD process. The disk surface is protected with the two films, i.e., the carbon protective film and the lubricant film thereover.The lubricants generally in use are fluoropolyethers having functional groups. Examples of functional groups are hydroxyl, amino and cyclophosphazene groups. Particularly, lubricants having a phosphazene group are materials having high resistance to decomposition and known as materials for giving high durability to magnetic disks (for example, Patent Literature 1, 2).The cyclophosphazene group takes the molecular structure of 6-membered ring comprised of three phosphorus atoms and three nitrogen atoms as a main skeleton, and two substituents lengthening up and down of the 6-membered ring from each phosphorus atom (for example, Nonpatent Literature 1). ...

Подробнее
Номер записи: 47
05-09-2013 дата публикации

Magnetic recording medium and method of manufacturing the same

Номер: US20130230742A1
Автор: Hiroyuki Hieda
Принадлежит: Toshiba Corp

According to one embodiment, a magnetic recording medium includes a data region and a servo region adjacent to the data region and including a magnetic recording layer, the magnetic recording layer including first and second patterned regions adjacent to each other, the first patterned region including a first nonmagnetic matrix and first magnetic particles dispersed in the first nonmagnetic matrix and having magnetization oriented in a first direction, the second patterned region includes a second nonmagnetic matrix and second magnetic particles dispersed in the second nonmagnetic matrix and having magnetization oriented in a second direction opposite to the first direction, sizes of the first magnetic particles being smaller than sizes of the second magnetic particles.

Подробнее
Номер записи: 48
05-09-2013 дата публикации

MAGNETIC STORAGE MEDIUM COMPRISED OF MAGNETIC NANOPARTICLES CONTAINED WITHIN NANOTUBES

Номер: US20130230743A1
Автор: Winarski Tyson York
Принадлежит: Sigma Pro Ltd. LLC

A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within nanotubes (e.g., carbon nanotubes). 1. A magnetic storage media , comprising:a nanotubes;a first magnetic nanoparticle configured to store binary information through magnetic polarization, said first magnetic nanoparticle contained within said nanotube;a second magnetic nanoparticle configured to store binary information through magnetic polarization, said second magnetic nanoparticle contained within said nanotube; anda non-magnetic nanoparticle, said non-magnetic nanoparticle contained within said nanotube between said first and second magnetic nanoparticles.2. The magnetic storage media of claim 1 , wherein said non-magnetic nanoparticle is comprised of a dielectric material.3. The magnetic storage media of claim 1 , wherein said nanotube is encapsulated within a data layer.4. The magnetic storage media of claim 1 , wherein said non-magnetic nanoparticle is comprised of an insulating material.5. The magnetic storage media of claim 1 , wherein said first and second magnetic nanoparticles and said non-magnetic nanoparticle are held in a stationary position within said nanotube by friction.6. The magnetic storage media of claim 1 , wherein said nanotube is a carbon nanotube. This application is a divisional of U.S. patent application Ser. No. 12/569,353, filed on Sep. 29, 2009, which is a continuation-in-part of U.S. patent application Ser. No. 12/403,729, filed Mar. 13, 2009, both of which are hereby incorporated by reference in their entirety. U.S. patent application Ser. No. 12/569,353 also claims the benefit of U.S. Provisional Patent Application No. 61/243,347, filed on Sep. 17, 2009, and is also hereby incorporated by reference in its entirety.The pursuit of higher performance computing systems is driving the reduction in scale of magnetic storage media. Higher storage densities allow for the reduction of device sizes, an enhancement of device capabilities, and a ...

Подробнее
Номер записи: 49
05-09-2013 дата публикации

Glass Substrate For Information Recording Medium

Номер: US20130231236A1
Автор: Kajita Hiroshi, KAWAI Hideki, Mori Toshiharu, Oogaki Akio
Принадлежит: Konica Minolta Advanced Layers, Inc.

The present invention relates to the glass substrate for an information recording medium comprising the following glass components: SiO: 52 to 67; AlO: 8 to 20; BO: 0 to 6, with these three oxides FMO: 70 to 85; LiO: 0.5 to 4; NaO: 1 to 8; KO: 0 to 5; and with these three oxides R2O: 5 to 15; MgO: 2 to 9; CaO: 0.1 to 5; BaO: 0 to 3; SrO: 0 to 3; ZnO: 0 to 5; and with these five oxides: 5 to 15; YO: 0 to 4; LaO: 0 to 4; GdO: 0 to 4; CeO: 0 to 4; TiO: 1 to 7; HfO: 0 to 2; ZrO: 0 to 5; NbO: 0.2 to 5; and TaO: 0 to 5, and satisfies LiO/R2O: 0.05 to 0.35; LiO/FMO: 0.005 to 0.035; LiO/(MgO+ZnO): less than 2 and NbO/SiO: 0.01 to 0.075. 1. A glass substrate for an information recording medium , comprising the following glass components in % by weight:{'sub': '2', 'SiO: 52 to 67%;'}{'sub': 2', '3, 'AlO: 8 to 20%;'}{'sub': 2', '3, 'BO: 0 to 6% (including zero);'}{'sub': 2', '2', '3', '2', '3, '(wherein FMO═SiO+AlO+BO=70 to 85%);'}{'sub': '2', 'LiO: 0.5 to 4%;'}{'sub': '2', 'NaO: 1 to 8%;'}{'sub': '2', 'KO: 0 to 5% (including zero);'}{'sub': 2', '2', '2, '(wherein R2O═LiO+NaO+KO=5 to 15%);'}MgO: 2 to 9%;CaO: 0.1 to 5%;BaO: 0 to 3% (including zero);SrO: 0 to 3% (including zero);ZnO: 0 to 5% (including zero);(wherein MgO+CaO+BaO+SrO+ZnO=5 to 15%);{'sub': 2', '3, 'YO: 0 to 4% (including zero);'}{'sub': 2', '3, 'LaO: 0 to 4% (including zero);'}{'sub': 2', '3, 'GdO: 0 to 4% (including zero);'}{'sub': '2', 'CeO: 0 to 4% (including zero);'}{'sub': '2', 'TiO: 1 to 7%;'}{'sub': '2', 'HfO: 0 to 2% (including zero);'}{'sub': '2', 'ZrO: 0 to 5% (including zero);'}{'sub': 2', '5, 'NbO: 0.2 to 5%; and'}{'sub': 2', '5, 'TaO: 0 to 5% (including zero); and'} [{'br': None, 'sub': '2', 'LiO/R2O: 0.05 to 0.35\u2003\u2003(1),'}, {'br': None, 'sub': '2', 'LiO/FMO: 0.005 to 0.035\u2003\u2003(2),'}, {'br': None, 'sub': '2', 'LiO/(MgO+ZnO): less than 2\u2003\u2003(3) and'}, {'br': None, 'sub': 2', '5', '2, 'NbO/SiO: 0.01 to 0.075\u2003\u2003(4).'}], 'satisfying the following composition relation ...

Подробнее
Номер записи: 50
19-09-2013 дата публикации

Write delay stabilization

Номер: US20130242428A1
Автор: Bruce Douglas Buch, David Erich Tetzlaff
Принадлежит: SEAGATE TECHNOLOGY LLC

Apparatus and method for write delay stabilization. A write driver is adapted to output bipolar write currents to write data to a memory. A preconditioning circuit is adapted to output first and second thermal preconditioning currents through the write driver to stabilize a write delay associated with the write driver to a steady-state level prior to the writing of data to the memory.

Подробнее
Номер записи: 51
19-09-2013 дата публикации

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

Номер: US20130242430A1
Автор: AOYAMA Tsutomu, Kaizu Akimasa, Soeno Yoshikazu
Принадлежит: TDK Corporation

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 ...

Подробнее
Номер записи: 52
26-09-2013 дата публикации

STAMPERS AND MAGNETIC DISKS

Номер: US20130250454A1
Автор: OKINO Takeshi
Принадлежит: KABUSHIKI KAISHA TOSHIBA

A stamper according to an embodiment includes a guide including: a first portion provided in regions to be boundaries between the servo region and the data regions in the bit-patterned medium, the first portion extending in a radial direction; and a second portion connected to the first portion, the second portion having protrusions regularly arranged at predetermined intervals in the radial direction, each of the protrusion having and being located on sides of regions to be the data regions, wherein, of angles formed between at least one of two sides of the triangular shape and a straight line extending in the radial direction, the smaller angle is in the range of 10 to 50 degrees, the two sides extending from a vertex of one of the protrusions. 1. A stamper to be used for manufacturing a bit-patterned medium that includes a plurality of data regions having a plurality of tracks and a servo region located between the data regions , each of the data regions extending in a circumferential direction of the tracks , the servo region extending in a radial direction ,the stamper comprisinga guide comprising:a first portion provided in regions to be boundaries between the servo region and the data regions in the bit-patterned medium, the first portion extending in a radial direction; anda second portion connected to the first portion, the second portion having protrusions regularly arranged at predetermined intervals in the radial direction, each of the protrusion having and being located on sides of regions to be the data regions,wherein, of angles formed between at least one of two sides of the triangular shape and a straight line extending in the radial direction, the smaller angle is in the range of 10 to 50 degrees, the two sides extending from a vertex of one of the protrusions.2. The stamper according to claim 1 , wherein claim 1 , of the angles formed between the respective two sides of the triangular shape and the straight line extending in the radial direction ...

Подробнее
Номер записи: 53
03-10-2013 дата публикации

MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME

Номер: US20130260179A1
Автор: KASADA Norihito, SATO Masahide, WATANABE Isamu
Принадлежит: FUJIFILM Corporation

An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer has a thickness of equal to or less than 300 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m/g to 40 m/g; and a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%. 1. A magnetic recording medium , which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support , whereinthe nonmagnetic layer has a thickness of equal to or less than 300 nm;a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa;{'sup': 2', '2, 'the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m/g to 40 m/g; and'}a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%.2. The magnetic recording medium according to claim 1 , wherein the abrasive is alumina.3. The magnetic recording medium according to claim 2 , wherein the magnetic layer further comprises an aromatic hydrocarbon compound having a phenolic hydroxyl group.5. The magnetic recording medium according to claim 3 , wherein the aromatic hydrocarbon compound having a phenolic hydroxyl group is selected from the group consisting of 2 claim 3 ,3-dihydroxylnaphthalene and derivatives thereof.6. The magnetic recording medium according to claim 1 , wherein the magnetic layer further comprises a nonmagnetic particle other than the abrasive.7. The magnetic recording medium according to claim 1 , wherein the magnetic layer ...

Подробнее
Номер записи: 54
03-10-2013 дата публикации

GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130260180A1
Автор: HASHIMOTO Toshiaki, KUDOH Yuriko, SAITO Yasuhiro
Принадлежит: HOYA CORPORATION

The present invention relates to a method for manufacturing a glass substrate for an information recording medium having a high level of cleanness and superior smoothness. The manufacturing method includes a step for washing a disk-shaped glass plate with an acid washing liquid, a step for removing at least part of a surface layer, which is formed on the surface of the glass plate, by performing grinding with diamond abrasion grains, and a step for washing the surface with a neutral or alkaline washing liquid. 1. A glass substrate for an information recording medium , the glass substrate comprising:a surface having an arithmetic mean roughness (Ra) deviation rate of 3% or less, wherein the Ra deviation rate is calculated based on arithmetic mean roughness (Ra) values measured using an atomic force microscope at 10 or more different measurement fields on the surface of the glass substrate, each measurement field having 10 μm×10 μm, and wherein the Ra deviation rate is the ratio of the number of measurement fields, each having an Ra value that differs by 0.1 nm or greater relative to a totality mean value of Ra values for all of the 10 or more measurement fields, with respect to the number of the 10 or more measurement fields.2. The glass substrate according to claim 1 , wherein the ratio of a maximum peak height (Rp) of the surface with respect to an arithmetic mean roughness (Ra) of the surface is 10 or less.3. The glass substrate according to claim 1 , wherein the surface has a maximum peak height (Rp) of 10 nm or less.4. The glass substrate according to claim 2 , wherein the maximum peak height (Rp) of the surface is 10 nm or less.5. The glass substrate according to claim 1 , wherein an arithmetic mean roughness (Ra) of the surface is 0.1 to 1.5 nm.6. The glass substrate according to claim 2 , wherein the arithmetic mean roughness (Ra) of the surface is 0.1 to 1.5 nm. This is a continuation application of U.S. patent application Ser. No. 13/050,167 filed Mar. 17, ...

Подробнее
Номер записи: 55
10-10-2013 дата публикации

Patterned magnetic media with offset data and servo regions

Номер: US20130265673A1
Автор: Jeffrey S. Lille, Michael K. Grobis, Ricardo Ruiz
Принадлежит: HGST NETHERLANDS BV

A patterned magnetic media having offset servo and data regions. The media can be constructed by a method that allows both a data region and a servo region to be patterned without the patterning of one region adversely affecting the patterning of the other region. The method results in a patterned data region a patterned servo region and intermediate regions between the servo and data regions. The intermediate regions, which are most likely, but not necessarily, asymmetrical with one another indicate that the method has been used to pattern the media.

Подробнее
Номер записи: 56
10-10-2013 дата публикации

LUBRICANT WITH NON-TERMINAL FUNCTIONAL GROUPS

Номер: US20130266822A1
Автор: Guo Xing-Cai, Marchon Bruno, Waltman Robert, Wang Run-Han
Принадлежит:

Lubricant with non-terminal functional groups. The location of the functional groups minimizes free chain length and molecular weight of a lubricant while simultaneously maximizing evaporation temperature. The locations of the functional groups to the backbone of the molecule of the lubricant allows for shorter lengths of free backbone length between functional groups attached to a lubricated surface. The lubricant lubricates mechanical devices including hard disk drives. The lubricant can also be added to media or other mechanical parts in conjunction with other lubricants. 2. The media disk of claim 1 , wherein the second lubricant molecule is A20H.3. The media disk of claim 1 , wherein the second lubricant molecule is X1P.4. The media disk of claim 1 , wherein the concentration of the first lubricant molecule in the lubricant is between 30% and 99%.5. The media disk of claim 4 , wherein the concentration of the first lubricant molecule in the lubricant is between 70% and 97%.6. The media disk of claim 5 , wherein the concentration of the first lubricant molecule in the lubricant is between 80% and 95%.7. The media disk of claim 2 , wherein the concentration of the first lubricant molecule in the lubricant is between 30% and 99%.8. The media disk of claim 7 , wherein the concentration of the first lubricant molecule in the lubricant is between 70% and 97%.9. The media disk of claim 8 , wherein the concentration of the first lubricant molecule in the lubricant is between 80% and 95%.11. The hard disk drive of claim 10 , wherein at least 30% of the lubricant molecules include at least three functional groups attached to a backbone and at least one of the three functional groups is a non-terminal functional group.12. The hard disk drive of claim 11 , wherein the at least 30% of the lubricant molecules have a molecular weight of less than 2100 AU.13. The hard disk drive of claim 11 , wherein the at least 30% of the lubricant molecules have a molecular weight of less ...

Подробнее
Номер записи: 57
24-10-2013 дата публикации

MAGNETIC DISK, LUBRICANT-LAYER-FORMING COMPOSITION FOR FORMING A LUBRICANT LAYER, AND METHOD FOR FORMING THE LUBRICANT LAYER

Номер: US20130280555A1
Автор: HARAMOTO Yuichiro, KODAMA Mitsuo
Принадлежит:

A magnetic disk according to one embodiment of the present invention includes a base material and a lubricant layer provided on or over a base material. The lubricant layer contains a rod-like ionic liquid crystal compound having a cation group and an anion group. 1. A magnetic disk comprising:a base material; anda lubricant layer provided on or over a base material, the lubricant layer containing a rod-like ionic liquid crystal compound having a cation group and an anion group.2. A magnetic disk according to claim 1 , wherein the cation group is a pyridinium group.4. A magnetic disk according to claim 3 , wherein the lubricant layer contains a plurality of kinds of rod-like ionic liquid crystal compounds.5. A magnetic disk according to claim 1 , wherein the rod-like ionic liquid crystal compound forms a vertical sequence in relation to a surface of an underlying layer.6. A magnetic disk according to claim 1 , wherein the lubricant layer has a monomolecular layer of the rod-like ionic liquid crystal compound in at least a part of a region where the lubricant layer is in contact with an underlying layer.7. A magnetic disk according to claim 1 , wherein the lubricant layer contains at least one of a non-ionic liquid crystal compound and a non-ionic lubricant.8. A magnetic disk according to claim 1 , further comprising:an ground layer provided in a surface of the base material;a magnetic layer provided in a surface of the ground layer; anda protective layer provided in a surface of the magnetic layer,wherein the lubricant layer is provided in a surface of the protective layer.9. A lubricant-layer-forming composition for forming a lubricant layer provided on a base material of a magnetic disk claim 1 , wherein the lubricant-layer-forming composition contains a rod-like ionic liquid crystal compound having a cation group and an anion group.10. A method for forming a lubricant layer claim 1 , comprising:{'claim-ref': {'@idref': 'CLM-00009', 'claim 9'}, 'applying the ...

Подробнее
Номер записи: 58
31-10-2013 дата публикации

Magnetic recording medium and magnetic memory device

Номер: US20130286505A1
Автор: Hiroshi Fukuda, Yoshihiro Shiroishi
Принадлежит: HITACHI LTD

There are provided a magnetic recording medium and a magnetic memory device capable of implementing high recording density, in the case of using a microwave assisted magnetic recording (MAMR) scheme. In a magnetic memory device including a magnetic recording medium having a recording film with three or more layers, a recording magnetic pole generating a recording magnetic field, an opposed magnetic pole, a high frequency magnetic field generating element generating a microwave for recording assist, and a magnetic reproduction element, an anisotropic field of a first layer which is a top layer of the recording film is larger than 20 kOe.

Подробнее
Номер записи: 59
31-10-2013 дата публикации

SYSTEMS AND METHODS FOR PROCESSING MAGNETIC MEDIA

Номер: US20130286510A1
Автор: Johnson Douglas W., Rothermel Stephen J.
Принадлежит: Imation Corp.

A system comprises a magnetic medium with a first magnetic gap adjacent a first side and a second magnetic gap adjacent a second side, opposite the first magnetic gap. The first magnetic gap generates first longitudinal and perpendicular field components. The second magnetic gap generates second longitudinal and perpendicular field components. The first and second longitudinal field components are substantially aligned along a recording layer of the magnetic medium, and the first and second perpendicular field components are substantially opposed across the recording layer of the magnetic medium. 1. A system comprising:a magnetic medium having a recording layer;a first magnetic gap adjacent a first side of the magnetic medium, the first magnetic gap generating a first longitudinal field component and a first perpendicular field component;a second magnetic gap adjacent a second side of the magnetic medium and opposite the first magnetic gap, the second magnetic gap generating a second longitudinal field component and a second perpendicular field component;wherein the first and second longitudinal field components are substantially aligned along the recording layer; andwherein the first and second perpendicular field components are substantially opposed across the recording layer.2. The system of claim 1 , wherein the magnetic medium comprises a perpendicular recording layer.3. The system of claim 2 , wherein the perpendicular recording layer comprises barium ferrite.4. The system of claim 1 , wherein the first and second longitudinal field components provide sufficient longitudinal bias to erase data from the recording layer.5. The system of claim 4 , wherein the first and second perpendicular field components provide a net perpendicular bias in the recording layer that is less ten percent of the longitudinal bias in the recording layer.6. The system of claim 1 , wherein the first and second magnetic gaps overlap in a tracking direction along the magnetic medium.7. ...

Подробнее
Номер записи: 60
07-11-2013 дата публикации

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

Номер: US20130293983A1
Автор: Hirayama Yoshiyuki, Igarashi Masukazu, WATANABE Katsuro
Принадлежит: Hitachi, Ltd.

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 ...

Подробнее
Номер записи: 61
28-11-2013 дата публикации

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

Номер: US20130316194A1
Автор: Isono Hideki, Murakami Akira, Sato Masamune, Sato Takashi, Tanino Hidekazu
Принадлежит: HOYA CORPORATION

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 ...

Подробнее
Номер записи: 62
05-12-2013 дата публикации

Write synchronization in bit patterned media using auxiliary read head

Номер: US20130321947A1
Автор: Michael K. Grobis
Принадлежит: HGST NETHERLANDS BV

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.

Подробнее
Номер записи: 63
05-12-2013 дата публикации

Double-layered sheet systems

Номер: US20130323475A1
Автор: Cameron Fouss, Richard D. Lefevre
Принадлежит: Magnum Magnetics Corp

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.

Подробнее
Номер записи: 64
19-12-2013 дата публикации

MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING SAME

Номер: US20130337290A1
Автор: NAKAMATA Yuko
Принадлежит: FUJI ELECTRIC CO., LTD.

A magnetic recording medium and related method of manufacturing a magnetic recording medium that has a protective layer for the magnetic recording medium and that exhibits excellent corrosion resistance in the protective layer. The magnetic recording medium includes on a nonmagnetic substrate a magnetic layer and a protective layer formed on the magnetic layer. The protective layer is formed of a lower layer in contact with the magnetic layer and an upper layer formed on the lower layer. The material used in the lower layer is a metal having a standard electrode potential of −0.8 to 0.3 V. 1. A magnetic recording medium comprising:a nonmagnetic substrate;a magnetic layer on the nonmagnetic substrate; and a lower layer, in contact with the magnetic layer, that is formed from a material having a standard electrode potential of −0.8 to 0.3 V and has a film thickness of at least 0.3 nm, and', 'an upper layer formed on the lower layer and formed from diamond-like carbon (DLC)., 'a protective layer on the magnetic layer, the protective layer having a total film thickness of at least 1.5 nm and comprising'}2. The magnetic recording medium according to claim 1 , wherein the material having the standard electrode potential of −0.8 to 0.3 V used in the lower layer of the protective layer is zinc claim 1 , indium claim 1 , tin claim 1 , germanium claim 1 , or a mixture thereof.3. The magnetic recording medium according to claim 1 , wherein the film thickness of the protective layer is 2.5 nm or less.4. The magnetic recording medium according to claim 2 , wherein the film thickness of the protective layer is 2.5 nm or less.5. A method of improving corrosion resistance of a magnetic recording medium having a nonmagnetic substrate and a magnetic layer on the nonmagnetic substrate claim 2 , comprising: forming a lower layer of the protective layer from a material having a standard electrode potential of −0.8 to 0.3 V and in contact with the magnetic layer, and', 'forming an upper ...

Подробнее
Номер записи: 65
26-12-2013 дата публикации

Magnetic exchange coupled core-shell nanomagnets

Номер: US20130342297A1
Автор: Seok Bae, Yang-Ki Hong
Принадлежит: University of Alabama UA

A permanent magnet is fabricated such that it has a magnetically hard core surrounded by a thin magnetically soft shell. The magnetically hard core provides a relatively high intrinsic coercivity (H ci ), and the magnetically soft shell provides a relatively high magnetic flux density (B). Due to magnetic exchange coupling between the core and shell, a relatively high maximum energy product (BH) max is achievable over a wide temperature range, including temperatures above 150° C. Further, such effects can be achieved without using rare-earth metals or precious metals helping to keep the manufacturing costs of the magnet low. To allow sufficient exchange magnetic coupling between the core and shell, the width of the shell is less than about 40 nanometers, and the overall dimensions are controlled such that the width of the shell is less than two times the Bloch domain wall thickness of the core.

Подробнее
Номер записи: 66
26-12-2013 дата публикации

GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, AND THEIR USE

Номер: US20130343166A1
Автор: HASHIMOTO Kazuaki, MATSUMOTO Naomi
Принадлежит: HOYA CORPORATION

An aspect of the present invention relates to glass for a magnetic recording medium substrate, which comprises essential components in the form of SiO, LiO, NaO, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO wherein a molar ratio of a content of CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20, and which has a glass transition temperature of equal to or higher than 650° C. 1. Glass for a magnetic recording medium substrate , which comprises:{'sub': 2', '2', '2, 'essential components in the form of SiO, LiO, NaO, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO;'}wherein a molar ratio of a content of CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20; and which has a glass transition temperature of equal to or higher than 650° C.2. The glass for a magnetic recording medium substrate according to claim 1 , which comprises claim 1 , denoted as molar percentages claim 1 ,{'sub': '2', '55 to 78 percent of SiO,'}{'sub': '2', 'greater than 0 percent and equal to or less than 5 percent of LiO,'}{'sub': '2', '2 to 15 percent of NaO, and'}10 to 25 percent of a combined content of MgO, CaO, SrO, and BaO.3. The glass for a magnetic recording medium substrate according to claim 2 , which comprises 0 to 12 mole percent of AlO.4. The glass for a magnetic recording medium substrate according to claim 1 , wherein a molar ratio claim 1 , CaO/NaO claim 1 , of a content of CaO relative to a content of NaO is equal to or less than 1.5.5. The glass for a magnetic recording medium substrate according to claim 1 , which comprises one or more selected from the group consisting of ZrO claim 1 , TiO claim 1 , YO claim 1 , LaO claim 1 , GdO claim 1 , NbO claim 1 , TaO claim 1 , and HfO.6. The glass for a magnetic recording medium substrate according to claim 1 , wherein ...

Подробнее
Номер записи: 67
02-01-2014 дата публикации

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

Номер: US20140002917A1
Автор: Amiya Daisuke, Sakai Hiroshi, TAKAHOSHI Hideaki
Принадлежит: SHOWA DENKO K.K.

A magnetic recording medium may have a stacked structure including a first soft magnetic layer, an orientation control layer, a lower recording layer, an intermediate layer, and an upper recording layer that are sequentially stacked, and a second soft magnetic layer provided between the lower recording layer and the intermediate layer. 1. A magnetic recording medium comprising:a stacked structure including a first soft magnetic layer, an orientation control layer, a lower recording layer, an intermediate layer, and an upper recording layer that are sequentially stacked; anda second soft magnetic layer provided between the lower recording layer and the intermediate layer.2. The magnetic recording medium as claimed in claim 1 , wherein the lower recording layer has a coercivity higher than that of the upper recording layer.3. The magnetic recording medium as claimed in claim 2 , wherein each of the first soft magnetic layer and the second soft magnetic layer is formed by an alloy selected from a group consisting of CoFe alloys claim 2 , FeCo alloys claim 2 , FeNi alloys claim 2 , FeAl alloys claim 2 , FeCr alloys claim 2 , FeTa alloys claim 2 , FeMg alloys claim 2 , FeZr alloys claim 2 , FeC alloys claim 2 , FeN alloys claim 2 , FeSi alloys claim 2 , FeP alloys claim 2 , FeNb alloys claim 2 , FeHf alloys claim 2 , and FeB alloys.4. The magnetic recording medium as claimed in claim 2 , wherein each of the first soft magnetic layer and the second soft magnetic layer is formed by a material having an Fe-content of 60 at % or higher and a microcrystal structure claim 2 , or a material having a granular structure in which microcrystal particles are dispersed within a matrix.5. The magnetic recording medium as claimed in claim 2 , wherein each of the first soft magnetic layer and the second soft magnetic layer is formed by a Co alloy having a Co-content of 80 at % or higher claim 2 , includes at least one of Zr claim 2 , Nb claim 2 , Ta claim 2 , Cr claim 2 , and Mo claim 2 ...

Подробнее
Номер записи: 68
09-01-2014 дата публикации

Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling

Номер: US20140011053A1
Автор: Kaizhong Gao, Lei Wang, Shaoping Li, Wenzhong Zhu, Xiaobin Wang
Принадлежит: SEAGATE TECHNOLOGY LLC

A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field H k extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.

Подробнее
Номер записи: 69
09-01-2014 дата публикации

METHOD OF PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM

Номер: US20140011054A1
Автор: SUZUKI Kouta
Принадлежит: WD MEDIA (SINGAPORE) PTE. LTD.

A perpendicular magnetic recording medium, including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. The perpendicular magnetic recording medium includes a magnetic recording layer a medium protective layer and a lubricating layer in this order on a base The medium is made using a CF bond density measuring step of measuring a CF bond density of a lubricant; and a lubricating layer forming step of forming a lubricating layer with the lubricant when the measured CF bond density is 2.0×10to 2.7×10atoms/cm. 1. A perpendicular magnetic recording medium , comprising:a base;a magnetic recording layer;a medium protective layer; anda lubricating layer in this order on the base,{'sup': 22', '22', '3, 'wherein the lubricating layer has a CF bond density of 2.0×10to 2.7×10atoms/cmcalculated based on a film thickness of the lubricating layer measured by using an ellipsometer or X-Ray Reflectivity and the number of CF bonds in a predetermined range of the lubricating layer counted by using Fourier Transform Infrared Spectroscopy or X-ray Photoelectron Spectroscopy.'}2. The perpendicular magnetic recording medium according to claim 1 , wherein the lubricant comprises perfluoropolyether (PFPE).3. The perpendicular magnetic recording medium according to claim 1 , wherein the thickness of the lubricant film is 10-16 angstroms.4. The perpendicular magnetic recording medium according to claim 1 , wherein the lubricant is a heat treated film.5. The perpendicular magnetic recording medium according to claim 1 , wherein the lubricant has an FT-IR absorbance value between 12 and 18.is a heat treated film. This is a Divisional of application Ser. No. 12/935,215 filed Dec. 21, 2010, claiming priority based on International Application No. PCT/JP2009/055794, filed on Mar. 24, 2009, which claims priority from Japanese Patent Application No. 2008-088875 filed Mar. 29, 2008. The entire ...

Подробнее
Номер записи: 70
09-01-2014 дата публикации

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

Номер: US20140011055A1
Автор: SUZUKI Hiroyuki, YAMAZAKI Nobuo
Принадлежит: FUJIFILM Corporation

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 ...

Подробнее
Номер записи: 71
16-01-2014 дата публикации

Analysis of pattern features

Номер: US20140014621A1
Автор: Gennady Gauzner, Nobuo Kurataka, Zhaoning Yu
Принадлежит: SEAGATE TECHNOLOGY LLC

The embodiments disclose a method for an electron curing reverse-tone process, including depositing an etch-resistant layer onto a patterned imprinted resist layer fabricated onto a hard mask layer deposited onto a substrate, curing the etch-resistant layer using an electron beam dose during etching processes of imprinted pattern features into the hard mask and into the substrate and using analytical processes to quantify reduced pattern feature placement drift errors and to quantify increased pattern feature size uniformity of imprinted pattern features etched.

Подробнее
Номер записи: 72
30-01-2014 дата публикации

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS USING THE SAME

Номер: US20140029137A1
Автор: HYODO Hiroyuki, MUSASHI Takayuki
Принадлежит: KABUSHIKI KAISHA TOSHIBA

According to one embodiment, letting (Rf) be main-chain portion CFO contained in a Fomblin lubricant and a compound containing a phosphazene ring and (R) be terminal group (CF—CH—O—)(NP)—O—CHCFcontained in the compound containing a phosphazene ring in a magnetic recording medium, the ratio, which is measured using TOF-SIMS, of the component of (R) to the component of (Rf) on the surface of a lubricant layer is 0.01 to 0.09%. 2. The medium according to claim 1 , wherein the protective layer is formed by using carbon.3. The medium according to claim 1 , wherein the protective layer has a thickness of 1.5 to 2.4 nm.4. The medium according to claim 2 , wherein the protective layer has a thickness of 1.5 to 2.4 nm.5. The medium according to claim 1 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.6. The medium according to claim 2 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.7. The medium according to claim 3 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.8. The medium according to claim 4 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.10. The apparatus according to claim 9 , wherein the protective layer is formed by using carbon.11. The apparatus according to claim 9 , wherein the protective layer has a thickness of 1.5 to 2.4 nm.12. The apparatus according to claim 10 , wherein the protective layer has a thickness of 1.5 to 2.4 nm.13. The apparatus according to claim 9 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.14. The apparatus according to claim 10 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.15. The apparatus according to claim 11 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm.16. The apparatus according to claim 12 , wherein the lubricant layer has a thickness of 0.9 to 1.6 nm. This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-164621, filed Jul. 25, 2012, the entire contents of which are ...

Подробнее
Номер записи: 73
06-02-2014 дата публикации

GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE AND USAGE THEREOF

Номер: US20140036644A1
Автор: HASHIMOTO Kazuaki, MATSUMOTO Naomi
Принадлежит: HOYA CORPORATION

An aspect of the present invention relates to glass for a magnetic recording medium substrate, which includes essential components in the form of SiO, LiO, NaO, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO, wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80, and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C. 1. Glass for a magnetic recording medium substrate , which comprises:{'sub': 2', '2', '2, 'essential components in the form of SiO, LiO, NaO, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO;'}wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80; and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.2. Glass for a magnetic recording medium substrate , which comprises:{'sub': 2', '2', '2, 'essential components in the form of SiO, LiO and NaO, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO;'}wherein a molar ratio of a content of CaO to a combined content of MgO, CaO, SrO, and BaO (CaO/(MgO+CaO+SrO+BaO)) is equal to or less than 0.20; and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.3. The glass for a magnetic recording medium substrate according to l claim 1 , which has an average coefficient of linear expansion at 100 to 300° C. of equal to or greater than 70×10/° C.4. The glass for a magnetic recording medium substrate according to claim 2 , which has an average coefficient of linear expansion at 100 to 300° C. of equal to or greater than 70×10/° C. ...

Подробнее
Номер записи: 74
20-02-2014 дата публикации

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

Номер: US20140050912A1
Автор: Isono Hideki, Murakami Akira, Sato Masamune, Sato Takashi, Tanino Hidekazu
Принадлежит: HOYA CORPORATION

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 ...

Подробнее
Номер записи: 75
06-03-2014 дата публикации

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

Номер: US20140064047A1
Автор: Kanbe Tetsuya, MURAKAMI Yuji, Niwa Kazuya, ZHANG LEI
Принадлежит: SHOWA DENKO K.K.

A magnetic recording medium of the present invention includes an under layer formed on a substrate, and a magnetic layer, formed on the under layer, which contains an alloy having an L1-type crystal structure as a main component. The under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 Å≦a<3.04 Å, a second under layer having a BCC structure with a lattice constant a of 3.04 Å≦a<3.18 Å, a third under layer having a BCC structure with a lattice constant a of 3.18 Å≦a<3.31 Å, and an upper under layer having a NaCl-type crystal structure. The first under layer has a B2 structure, or has a BCC structure containing Cr as a main component. In the magnetic recording medium of the present invention, information is recorded using a heat-assisted magnetic recording type, or a microwave-assisted magnetic recording type. 1. A magnetic recording medium comprising:an under layer formed on a substrate; and{'sub': '0', 'a magnetic layer, formed on the under layer, which contains an alloy having an L1-type crystal structure as a main component,'}wherein the under layer includes, in order from the substrate side,a first under layer with a lattice constant a of 2.87 Å≦a<3.04 Å,a second under layer having a BCC structure with a lattice constant a of 3.04 Å≦a<3.18 Å,a third under layer having a BCC structure with a lattice constant a of 3.18 Å≦a<3.31 Å, andan upper under layer having a NaCl-type crystal structure,the first under layer has a B2 structure, or has a BCC structure containing Cr as a main component, andinformation is recorded using a heat-assisted magnetic recording type or a microwave-assisted magnetic recording type.2. The magnetic recording medium according to claim 1 , wherein the first under layer is made of Cr and has a BCC structure claim 1 , or contains Cr as a main component claim 1 , and contains at least one of Ti claim 1 , V claim 1 , Mo claim 1 , W claim 1 , Nb claim 1 , Ta claim 1 , Mn claim 1 , and Ru ...

Подробнее
Номер записи: 76
06-03-2014 дата публикации

CYCLOPHOSPHAZENE COMPOUND, LUBRICANT CONTAINING SAME, AND MAGNETIC DISK

Номер: US20140065443A1
Автор: KOBAYASHI Nagayoshi, SAGATA Ryosuke
Принадлежит: MORESCO CORPORATION

A compound of the formula (), lubricant containing the compound and magnetic disk 2. A compound as defined in wherein x and y are each a real number of 0 to 10 claim 1 , z is a real number of 1 to 10 and n is a real number of 0 to 4.4. A lubricant as defined in wherein x and y are each a real number of 0 to 10 claim 3 , z is a real number of 1 to 10 and n is a real number of 0 to 4.6. A magnetic disk as defined in wherein x and y are each a real number of 0 to 10 claim 5 , z is a real number of 1 to 10 and n is a real number of 0 to 4.7. A compound as defined in wherein the hydroxyalkyl is —CHCH(OH)CHOH claim 1 , —CHCH(OH)CHOCHCH(OH)CHOH or —(CH)OH claim 1 , m is an integer of 2 to 6.8. A compound as defined in wherein the amino is (alkyl group having 1 to 6 carbon atoms)N— or (NH-alkylene group having 1 to 4 carbon atoms)N—.9. A compound as defined in wherein the amido is (alkyl group having 1 to 4 carbon atoms)NCO—. The present invention relates to a cyclophosphazene compound, lubricants containing the compound and magnetic disks having the lubricant applied thereto.With an increase in the recording density of magnetic disks, the distance between the magnetic disk serving as a recording medium and the head for use in recording of information or playback has become almost nil close to contact therebetween. The magnetic disk is provided over the surface thereof with a carbon protective film or lubricant film for the purpose of diminishing abrasion due to the contact or sliding of the head thereon or preventing contamination of the disk surface.The carbon protective film is produced generally by the sputtering process or CVD process. The disk surface is protected with the two films, i.e., the carbon protective film and the lubricant film thereover.The lubricants generally in use are fluoropolyethers having functional groups. Examples of functional groups are hydroxyl, amino and cyclophosphazene groups. Particularly, lubricants having a phosphazene group are materials ...

Подробнее
Номер записи: 77
06-03-2014 дата публикации

MAGNETIC RECORDING MEDIUM

Номер: US20140065445A1
Автор: KATANO Tomonori, KUMAGAI Akiyasu, ONO Hiromi, SATO Narumi, TANIGUCHI Katsumi, Uchida Shinji
Принадлежит: FUJI ELECTRIC CO., LTD.

A magnetic recording medium includes a substrate having sequentially formed thereon a magnetic layer; a protective layer having a thickness ranging from 1.0 nm to 2.5 nm and being composed of an amorphous metal layer having a thickness of at least 0.3 nm formed on the magnetic layer, and a carbon layer composed of amorphous carbon having a thickness of at least 0.3 nm formed on the amorphous metal layer; and a lubricating layer, wherein the carbon layer includes nitrogen atoms in a surface thereof in which a ratio of number of nitrogen atoms to total number of carbon atoms, nitrogen atoms, and oxygen atoms is 14 atomic % or less. Recording performance is improved by reducing the thickness of the protective layer thereof. A method of manufacturing the magnetic recording medium includes performing a nitrogen plasma treatment on a surface of the carbon layer that is effective to adjust the ratio. 1. A magnetic recording medium , comprising:a substrate having sequentially formed thereon, in the order recited,a magnetic layer;a protective layer having a thickness ranging from 1.0 nm to 2.5 nm and being comprised of an amorphous metal layer having a thickness of at least 0.3 nm formed on the magnetic layer, and a carbon layer comprised of amorphous carbon having a thickness of at least 0.3 nm formed on the amorphous metal layer; anda lubricating layer,wherein the carbon layer includes nitrogen atoms in a surface thereof in which a ratio of number of nitrogen atoms to total number of carbon atoms, nitrogen atoms, and oxygen atoms is 14 atomic % or less.2. The magnetic recording medium according to claim 1 , wherein the amorphous metal layer is made of amorphous metal composed of at least one kind of material selected from the group consisting of Si (silicon) claim 1 , Al (aluminum) claim 1 , Ge (germanium) claim 1 , Ti (titanium) claim 1 , Zr (zirconium) claim 1 , Hf (hafnium) claim 1 , V (vanadium) claim 1 , Nb (niobium) claim 1 , Ta (tantalum) claim 1 , Cr (chromium) ...

Подробнее
Номер записи: 78
13-03-2014 дата публикации

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME

Номер: US20140072828A1
Автор: INABA Yuki, SHIMATSU Takehito
Принадлежит: FUJI ELECTRIC CO., LTD.

Provided are a perpendicular magnetic recording medium and a method for manufacturing the same, the perpendicular magnetic recording medium including an alloy (FePt, FePd, or CoPt) having a large Kvalue with an L1type ordered structure, and obtained with achievement of controlled crystal orientation and thin film formation without heating. Specifically, in the perpendicular magnetic recording medium, at least a nonmagnetic seed layer, a nonmagnetic underlayer, and a magnetic layer are formed in this order on a nonmagnetic substrate. The nonmagnetic seed layer includes a MgO layer and a metal layer having a body-centered cubic (bcc) structure. The nonmagnetic underlayer has a NaCl type structure of one selected from the group consisting of MgO, NiO, TiO, CrN, Ti carbides, and Ti nitrides. The magnetic layer includes an alloy selected from the group consisting of FePt, FePd, and CoPt having an L1type ordered structure. 1. A perpendicular magnetic recording medium comprising a nonmagnetic seed layer , a nonmagnetic underlayer , and a magnetic layer formed in this order on a nonmagnetic substrate , whereinthe nonmagnetic seed layer includes a MgO layer and a metal layer having a body-centered cubic (bcc) structure,the nonmagnetic underlayer has a NaCl type structure of one selected from the group consisting of MgO, NiO, TiO, CrN, Ti carbides, and Ti nitrides, and{'sub': '0', 'the magnetic layer includes an alloy selected from the group consisting of FePt, FePd, and CoPt having an L1type ordered structure.'}2. The perpendicular magnetic recording medium according to claim 1 , wherein all of a (001) crystal lattice plane of the metal layer claim 1 , a (001) crystal lattice plane of the NaCl type structure in the nonmagnetic underlayer claim 1 , and a (001) crystal lattice plane of the L1type ordered structure in the magnetic layer are parallel to a film surface.3. The perpendicular magnetic recording medium according to claim 1 , wherein a surface energy difference ...

Подробнее
Номер записи: 79
27-03-2014 дата публикации

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

Номер: US20140085750A1
Автор: KITSUNAI Kouji, MAEDA Takashi
Принадлежит: HOYA CORPORATION

A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface shape is given as a microwaviness Rq, the difference between the microwavinesses Rq of the regions is 0.02 nm or less or the difference between standard deviations of the microwavinesses Rq of the regions is 0.04 nm or less. 1. A glass substrate for a magnetic disk , wherein , in regions with respect to two places arbitrarily selected on a surface of the glass substrate on a central portion side relative to an outer peripheral end , a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and , assuming that a root mean square of the surface shape is given as a microwaviness (MW-Rq) , a difference between the microwavinesses (MW-Rq) of the regions is 0.02 nm or less ,wherein the two places are an outer peripheral end portion of the disk and a central portion of a recording/reproducing area of the disk,wherein the outer peripheral end portion of the disk is a region failing within a predetermined distance inward and outward from a point located 1.0 mm inward from an outer peripheral end of the disk toward a center of the disk,wherein the microwaviness (MW-Rq) is measured using a laser Doppler vibrometer,wherein an average value of the microwaviness (MW-Rq) on a main surface of the glass substrate is 0.4 nm or less.2. A glass substrate for a magnetic disk according to claim 1 , wherein an outer peripheral end portion shape of the glass substrate is a shape falling within a range of ±30 nm with respect to a main surface as a reference plane.3. A glass substrate for a magnetic disk according to claim 1 , wherein the ...

Подробнее
Номер записи: 80
27-03-2014 дата публикации

MAGNETIC RECORDING MEDIUM COATING COMPOSITION AND MAGNETIC RECORDING MEDIUM

Номер: US20140087211A1
Автор: OMURA Kazufumi
Принадлежит: FUJIFILM Corporation

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 ...

Подробнее
Номер записи: 81
27-03-2014 дата публикации

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

Номер: US20140087212A1
Автор: Imai Takashi, OMURA Kazufumi
Принадлежит: FUJIFILM Corporation

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 , ...

Подробнее
Номер записи: 82
03-04-2014 дата публикации

Method of manufacturing hexagonal ferrite magnetic particles

Номер: US20140091501A1
Автор: Kazufumi Omura, Yasushi Hattori
Принадлежит: Fujifilm Corp

The method of manufacturing hexagonal ferrite magnetic particles, which includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an alkaline earth metal salt and an iron salt to cause ferritization; and further includes causing a glass component to adhere to the particles and then conducting the calcination of the particles to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis; and removing the glass component from a surface of the calcined product that has been formed.

Подробнее
Номер записи: 83
03-04-2014 дата публикации

LUBRICANT COMPOSITIONS CONTAINING FLUOROOXIRANES

Номер: US20140093641A1
Автор: Bulinski Michael J., Costello Michael G., Flynn Richard M., Kehren Jason M., Minday Richard M., Owens John G.
Принадлежит: 3MM INNOVATIVE PROPERTIES COMPANY

An lubricant composition comprising a Cto Cfluorooxirane fluid having a boiling point ≧20° C., and a lubricant soluble or dispersible therein, is provided. 1. A lubricant composition comprising 90 to about 99.99 wt. % of a Cto Cfluorooxirane fluid having a boiling point 20° C. , and 0.01 to 10 wt. % of a perfluoropolyether lubricant soluble or dispersible therein.2. The lubricant composition of wherein the fluorooxirane is a perfluorooxirane.4. The lubricant composition of wherein the perfluorooxirane is a Cto Cperfluorooxirane.6. The lubricant composition of wherein the fluorooxirane has a global warming potential of less than 10 claim 1 ,000.7. The lubricant composition of wherein the fluorooxirane is selected from 2 claim 1 ,3-difluoro-2-(1 claim 1 ,2 claim 1 ,2 claim 1 ,2-tetrafluoro-1-trifluoromethyl-ethyl)-3-trifluoromethyl-oxirane claim 1 , 2-fluoro-2-pentafluoroethyl-3 claim 1 ,3-bis-trifluoromethyl-oxirane claim 1 , 1 claim 1 ,2 claim 1 ,2 claim 1 ,3 claim 1 ,3 claim 1 ,4 claim 1 ,4 claim 1 ,5 claim 1 ,5 claim 1 ,6-decafluoro-7-oxa-bicyclo[4.1.0]heptane claim 1 , 2 claim 1 ,3-difluoro-2-trifluoromethyl-3-pentafluoroethyl-oxirane claim 1 , 2 claim 1 ,3-difluoro-2-nonafluorobutyl-3-trifluoromethyl-oxirane claim 1 , 2 claim 1 ,3-difluoro-2-heptafluoropropyl-3-pentafluoroethyl-oxirane claim 1 , 2-fluoro-3-pentafluoroethyl-2 claim 1 ,3-bis-trifluoromethyl-oxirane claim 1 , 2 claim 1 ,3-bis-pentafluoroethyl-2 claim 1 ,3-bistrifluoromethyl-oxirane claim 1 , and oxiranes of HFP trimers claim 1 , including 2-pentafluoroethyl-2-(1 claim 1 ,2 claim 1 ,2 claim 1 ,2-tetrafluoro-1-trifluoromethyl-ethyl)-3 claim 1 ,3-bis-trifluoromethyl-oxirane claim 1 , 2-fluoro-3 claim 1 ,3-bis-(1 claim 1 ,2 claim 1 ,2 claim 1 ,2-tetrafluoro-1-trifluoromethyl-ethyl)-2-trifluoromethyl-oxirane claim 1 , 2-fluoro-3-heptafluoropropyl-2-(1 claim 1 ,2 claim 1 ,2 claim 1 ,2-tetrafluoro-1-trifluoromethyl-ethyl)-3-trifluoromethyl-oxirane and 2-(1 claim 1 ,2 claim 1 ,2 claim 1 ,3 claim 1 ,3 claim ...

Подробнее
Номер записи: 84
03-04-2014 дата публикации

DUAL-LAYER MAGNETIC RECORDING STRUCTURE

Номер: US20140093745A1
Автор: Fan Zhaohui
Принадлежит: SEAGATE TECHNOLOGY, LCC

The embodiments disclose a dual-layer magnetic recording structure including a top magnetic layer etched to remove patterned portions of the top magnetic layer and a bottom magnetic layer including portions with altered magnetic properties of molecules to reduce net magnetic moments and including portions of unaltered magnetic properties exchange-coupled through the top magnetic layer. 1. A dual-layer magnetic recording structure , comprising:etching first recording layer features into a top magnetic layer;altering magnetic properties of molecules of portions of a bottom magnetic layer using chemical processes to reduce net magnetic moments; andseparating magnetically top and bottom magnetic structure recording layer features to create exchange-coupling between the layers.2. The method of claim 1 , wherein the top magnetic layer includes the deposition of a coupled continuous layer using magnetic materials.3. The method of claim 1 , wherein etching the top magnetic layer includes using nano-imprint lithography and includes using high density stack patterns including bit patterned media.4. The method of claim 1 , wherein the bottom magnetic layer includes the deposition of magnetic materials whose molecular magnetic properties are susceptible to alteration using chemical processes.5. The method of claim 1 , wherein the bottom magnetic layer includes the deposition of magnetic materials including a granular layer including columnar magnetic grains.6. The method of claim 5 , wherein the granular layer is configured to switch together as a single grain in dual-layer recording layer features and is configured to include magnetic decoupling by grain boundaries using non-magnetic materials including silicon oxide (SiO) claim 5 , titanium oxide (TiO) and carbon (C).7. The method of claim 1 , wherein the bottom magnetic layer includes the deposition of non-granular magnetic materials.8. The method of claim 1 , wherein chemical processes used to alter magnetic properties of ...

Подробнее
Номер записи: 85
03-04-2014 дата публикации

MAGNETIC STACK INCLUDING TiN-X INTERMEDIATE LAYER

Номер: US20140093748A1
Автор: Chen Jingsheng, Ju Ganping, Li Huihui, Peng Yingguo
Принадлежит: SEAGATE TECHNOLOGY LLC

A magnetic stack includes a substrate, a magnetic recording layer, and a TiN—X layer disposed between the substrate and the magnetic recording layer. In the TiN—X layer, X is a dopant comprising at least one of MgO, TiO, TiO, ZrN, ZrO, ZrO, HfN, HfO, AlN, and AlO. 1. A stack , comprising;a substrate;a magnetic recording layer; anda TiN-X layer disposed between the substrate and the magnetic recording layer, wherein X is a dopant.2. The stack of claim 1 , wherein X comprises at least one of MgO claim 1 , TiO claim 1 , TiO claim 1 , ZrN claim 1 , ZrO claim 1 , ZrO claim 1 , HfN claim 1 , HfO claim 1 , AlN claim 1 , and AlO.3. The stack of claim 1 , wherein the magnetic recording layer comprises:{'sub': '3', 'magnetic crystalline grains comprising at least one of FePt, FeXPt alloy, FePd, FeXPd, CoPt; and'}a non-magnetic segregant disposed between the crystalline grains and comprising at least one of an oxide, nitride, boride, and carbide material.4. The stack of claim 1 , wherein X is TiOand X is present in the TiN-X layer in an amount greater than 0 and less than or equal to about 40 vol. %.5. The stack of claim 1 , wherein X is ZnOand X is present in the TiN-X layer in an amount greater than 0 and less than or equal to about 30 vol. %.6. The stack of claim 1 , wherein:{'sub': '2', 'X comprises TiO; and'}the magnetic recording layer comprises magnetic crystalline grains and non-magnetic segregant disposed between the crystalline grains and the crystalline grains have an average diameter in the plane of the magnetic layer that is less than about 8.5 nm.7. The stack of claim 1 , wherein:{'sub': '2', 'X comprises ZnO; and'}the magnetic recording layer comprises magnetic crystalline grains and non-magnetic segregant disposed between the crystalline grains and the crystalline grains have an average diameter in the plane of the magnetic layer that is less than about 6 nm.8. The stack of claim 1 , wherein the magnetic recording layer comprises magnetic crystalline grains of ...

Подробнее
Номер записи: 86
10-04-2014 дата публикации

Recording medium for heat-assisted-magnetic-recording (hamr) and method for manufacturing the same

Номер: US20140099517A1
Автор: Jiangfeng HU, Jianzhong Shi, Kiat Min Cher, Tiejun Zhou, Wai Lwin Phyoe
Принадлежит: Agency for Science Technology and Research Singapore

According to embodiments of the present invention, a method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) is provided. The method includes forming an underlayer on a substrate, the underlayer including a precursor material, epitaxially depositing an interlayer on the underlayer, forming a recording layer over the interlayer, and converting the precursor material to a converted material having a thermal conductivity that is higher than a thermal conductivity of the recording layer. According to further embodiments of the present invention, another method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) and a recording medium for heat-assisted-magnetic-recording (HAMR) are also provided.

Подробнее
Номер записи: 87
06-01-2022 дата публикации

Sputtering Target, Method for Producing Laminated Film, Laminated Film and Magnetic Recording Medium

Номер: US20220005505A1
Автор: Iwabuchi Yasuyuki, Masuda Manami, Shimizu Masayoshi
Принадлежит:

A sputtering target according to the present invention contains Co and one or more metals selected from the group consisting of Cr and Ru, as metal components, wherein a molar ratio of the content of the one or more metals to the content of Co is ½ or more, and wherein the sputtering target contains NbOas a metal oxide component. 1. A sputtering target containing Co and one or more metals including at least Ru of Cr and Ru , as metal components , wherein a molar ratio of a content of the one or more metals including the at least Ru of Cr and Ru to a content of Co is ½ or more , wherein the sputtering target contains NbOas a metal oxide component , wherein the sputtering target has a content of NbOof from 2 mol % to 5 mol % and further comprises at least one metal oxide other than NbO , and wherein the sputtering target has a total content of metal oxides including NbOof 30 vol % or more.2. The sputtering target according to claim 1 , wherein the at least one metal oxide other than the NbOis at least one metal oxide selected from the group consisting of TiO claim 1 , SiO claim 1 , BO claim 1 , CoO claim 1 , COO claim 1 , CrO claim 1 , TaO claim 1 , ZnO claim 1 , and MnO.3. The sputtering target according to claim 1 , wherein the sputtering target contains Co in an amount of from 15 mol % to 60 mol %.4. The sputtering target according to claim 1 , wherein the sputtering target contains Cr and/or Ru claim 1 , and wherein a total content of Cr and Ru is from 30 mol % to 60 mol %.5. The sputtering target according to claim 1 , wherein the sputtering target further contains Pt in an amount of from 5 mol % to 30 mol % as a metal component.6. A method for producing a laminated film claim 1 , comprising forming an intermediate layer on a base layer containing Ru by sputtering using the sputtering target according to .7. The method for producing the laminated film according to claim 6 , further comprising forming a magnetic layer on the intermediate layer by sputtering using ...

Подробнее
Номер записи: 88
02-01-2020 дата публикации

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

Номер: US20200002258A1
Автор: FUKUMOTO Naoya, Ito Naoko, MIYASAKA Ryuuta, Murofushi Katsumi, SERI Michio, TOMITA Hiroyuki
Принадлежит: SHOWA DENKO K.K.

A fluorine-containing ether compound according to the present invention is a fluorine-containing ether compound represented by the following General Formula (1). 2. The fluorine-containing ether compound according to claim 1 ,wherein A in the General Formula (1) is a linking group having at least one polar group and having 1 to 20 carbon atoms.4. The fluorine-containing ether compound according to claim 1 ,wherein the number-average molecular weight is in a range of 1,000 to 10,000.11. A lubricant for a magnetic recording medium comprising the fluorine-containing ether compound according to .12. A magnetic recording medium in which at least a magnetic layer claim 1 , a protective layer claim 1 , and a lubricating layer are sequentially provided on a substrate claim 1 ,{'claim-ref': {'@idref': 'CLM-00011', 'claim 11'}, 'wherein the lubricating layer consists of the lubricant for a magnetic recording medium according to .'}13. The magnetic recording medium according to claim 12 ,wherein the average film thickness of the lubricating layer is 0.5 nm to 3 nm. The present invention relates to a fluorine-containing ether compound, a lubricant for a magnetic recording medium, and a magnetic recording medium.Priority is claimed on Japanese Patent Application No. 2017-039820, filed Mar. 2, 2017, the content of which is incorporated herein by reference.The development of magnetic recording media suitable for a high recording density has progressed in order to improve the recording density of magnetic recording and reproducing devices.In the related art, magnetic recording media are known that have a recording layer or the like laminated on a substrate for a magnetic recording medium, a protective layer made of carbon or the like formed on the recording layer, and a lubricating layer additionally formed on the protective layer. The protective layer protects information recorded in the recording layer and improves the slidability of a magnetic head. However, it is not possible ...

Подробнее
Номер записи: 89
01-01-2015 дата публикации

Magnetic recording medium and magnetic recording/reproduction apparatus

Номер: US20150004436A1
Автор: Takeshi Iwasaki
Принадлежит: Toshiba Corp

According to one embodiment, a perpendicular magnetic recording medium has an arrangement obtained by sequentially stacking a nonmagnetic substrate, a soft magnetic underlayer, a nonmagnetic seed layer containing silver grains having an fcc structure and an amorphous germanium grain boundary formed between the silver grains, a reaction barrier layer containing 90 at % or more of silver or aluminum and having a thickness of 2 nm or less, a nonmagnetic interlayer formed on the reaction barrier layer and made of ruthenium or a ruthenium alloy, and a perpendicular magnetic recording layer.

Подробнее
Номер записи: 90
01-01-2015 дата публикации

METHOD FOR FORMING PATTERN, METHOD FOR PRODUCING MAGNETIC RECORDING MEDIUM USING THE SAME, MAGNETIC RECORDING MEDIUM, AND METHOD FOR PRODUCING STAMPER

Номер: US20150004438A1
Автор: Iwasaki Takeshi, Kimura Kaori, TAKEO Akihiko, Takizawa Kazutaka, Watanabe Akira
Принадлежит: KABUSHIKI KAISHA TOSHIBA

According to one embodiment, there is provided a method for forming a pattern including forming an island-like metal underlayer comprised of a first metal, a phase-separated release layer including a first metal, a second metal, and a metal oxide, a mask layer, and a resist layer on a processed layer in this order, forming a concave-convex pattern on the resist layer, transferring the pattern to the mask layer, the phase-separated release layer, and the processed layer in this order, dissolving the phase-separated release layer using a peeling liquid for dissolving the first metal and the second metal, and removing the mask layer from the processed layer to expose the concave-convex pattern. 1. A method for forming a pattern comprising:forming a processed layer on a substrate;forming an island-like metal underlayer including a first metal on the processed layer;forming a phase-separated release layer including at least a first metal, a second metal different from the first metal, and a metal oxide on the processed layer and the island-like metal underlayer;forming a mask layer on the phase-separated release layer;forming a concave-convex pattern on the mask layer;transferring the concave-convex pattern to the mask layer;transferring the concave-convex pattern to the phase-separated release layer;transferring the concave-convex pattern to the processed layer; anddissolving the phase-separated release layer using a peeling liquid for dissolving the first metal and the second metal and removing the mask layer from the processed layer to expose the concave-convex pattern comprised of the processed layer.2. The method for forming a pattern according to claim 1 , wherein the first metal and the second metal are soluble in the peeling liquid and the metal oxide is insoluble in the peeling liquid.3. The method for forming a pattern according to claim 1 , wherein the release layer has a surface roughness of 0.2 nm or less.4. The method for forming a pattern according to ...

Подробнее
Номер записи: 91
05-01-2017 дата публикации

MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME

Номер: US20170004856A1
Автор: KASADA Norihito, Oyanagi Masahito, SUGISHIMA Akinori, TADA Toshio, YAMASHITA Tatsuya
Принадлежит: FUJIFILM Corporation

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 , ...

Подробнее
Номер записи: 92
05-01-2017 дата публикации

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

Номер: US20170004912A1
Автор: Masashi Shirata
Принадлежит: Fujifilm Corp

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.

Подробнее
Номер записи: 93
07-01-2016 дата публикации

MAGNETIC RECORDING MEDIUM

Номер: US20160005430A1
Автор: KAWAKAMI Shinji, Kuse Sadamu, Tanaka Kenji
Принадлежит: HITACHI MAXELL, LTD.

The magnetic recording medium of the present invention comprises: a non-magnetic substrate; a non-magnetic layer formed on one of principal surfaces of the non-magnetic substrate; and a magnetic layer formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate. Mr and t satisfy 0.0020 μT·m≦Mr·t≦0.0150 μT·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, L1 satisfies 2 nm≦L1≦6 nm, where L1 is the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, and L2 satisfies 0.1≦L2/t≦0.45, where L2 is the average thickness of a second mixed layer that is formed on the surface of the magnetic layer facing the non-magnetic layer. 1. A magnetic recording medium comprising: a non-magnetic substrate; a non-magnetic layer formed on one of principal surfaces of the non-magnetic substrate; and a magnetic layer formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate ,wherein the magnetic layer contains a magnetic powder,the magnetic powder is one selected from the group consisting of a hexagonal ferrite magnetic powder and a ferromagnetic metallic iron magnetic powder,Mr and t satisfy 0.0020 μT·m≦Mr·t≦0.0150 μT·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, L1 satisfies 2 nm≦L1≦6 nm, where L1 is the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, andthe magnetic layer has the average thickness of 20 to 100 nm.2. The magnetic recording medium according to claim 1 , wherein L1 as the average thickness of the first mixed layer satisfies 2 nm≦L1≦4 nm claim 1 , and L2 as the average thickness of the second mixed layer satisfies 0.1≦L2/t≦0.40.3. The magnetic recording medium according to claim 1 , wherein L2 ...

Подробнее
Номер записи: 94
07-01-2016 дата публикации

GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK

Номер: US20160005431A1
Автор: Takahashi Takeyoshi, TAMAKI Masanori, Ueda Masaaki
Принадлежит: HOYA CORPORATION

A magnetic-disk glass substrate has a circular center hole, a pair of main surfaces and an edge surface. The edge surface has a side wall surface and chamfered surfaces interposed between the side wall surface and the main surfaces, and a roundness of an edge surface on an outer circumferential side is 1.5 μm or less. Also, a midpoint A between centers of two least square circle respectively derived from outlines in a circumferential direction respectively obtained at two positions spaced apart by 200 μm in a substrate thickness direction on the side wall surface on the outer circumferential side, and centers B and C respectively derived from a respective one of two chamfered surfaces on the outer circumferential side in the substrate thickness direction, are located such that a sum of respective distances between A and B, and A and C, is 1 μm or less. 1. A magnetic-disk glass substrate having a circular hole at a center , the magnetic-disk glass substrate comprising:a pair of main surfaces; andan edge surface, the edge surface having a side wall surface and chamfered surfaces interposed between the side wall surface and the main surfaces,a roundness of the edge surface on an outer circumferential side being 1.5 μm or less, andwhen outlines in a circumferential direction are respectively obtained at two positions spaced apart by 200 μm in a substrate thickness direction on the side wall surface on the outer circumferential side, and a midpoint between centers of two least square circles respectively derived from the outlines is given as a midpoint A, andwhen outlines in the circumferential direction are respectively obtained at positions that are located at centers of the two chamfered surfaces on the outer circumferential side in the substrate thickness direction, and among centers of least square circles derived from the outlines, a center derived from one chamfered surface is given as a center B, and a center derived from the other chamfered surface is given as a ...

Подробнее
Номер записи: 95
07-01-2021 дата публикации

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

Номер: US20210005219A1
Автор: Azuma Yu, HASEGAWA Kota
Принадлежит:

A magnetic recording medium includes a non-magnetic substrate; a soft magnetic layer; a first seed layer; a second seed layer; an underlayer; and a perpendicular magnetic recording layer. The soft magnetic layer, the first seed layer, the second seed layer, the underlayer and the perpendicular magnetic recording layer are disposed on the non-magnetic substrate in this order. The first seed layer includes MoS, hexagonal-BN, WS, WSeor graphite. The second seed layer includes AlN having a hexagonal wurtzite type crystal structure. The underlayer includes Ru. 1. A magnetic recording medium comprising:a non-magnetic substrate;a soft magnetic layer;a first seed layer;a second seed layer;an underlayer; anda perpendicular magnetic recording layer,wherein the soft magnetic layer, the first seed layer, the second seed layer, the underlayer and the perpendicular magnetic recording layer are disposed on the non-magnetic substrate in this order,{'sub': 2', '2', '2, 'wherein the first seed layer includes MoS, h-BN, WS, WSeor graphite,'}wherein the second seed layer includes AlN having a hexagonal wurtzite type crystal structure, and wherein the underlayer includes Ru.2. The magnetic recording medium according to claim 1 , wherein the second seed layer has an average crystal grain size within a range of 3 nm to 12 nm.3. The magnetic recording medium according to claim 1 , wherein the second seed layer has a thickness within a range from 0.5 nm to 20 nm.4. The magnetic recording medium according to claim 1 , wherein the soft magnetic layer has an amorphous structure.5. A method of manufacturing the magnetic recording medium according to claim 1 , the method comprising:depositing the second seed layer by a reactive sputtering method using a pulse voltage,wherein, when depositing the second seed layer, the pulse voltage is less than or equal to −300 V, a pulse current is greater than or equal to 10 A, a duty cycle is less than or equal to 10%, Al is used as a target, and nitrogen is ...

Подробнее
Номер записи: 96
07-01-2021 дата публикации

SPACER, LAMINATE OF SUBSTRATES, METHOD FOR MANUFACTURING SUBSTRATE, AND METHOD FOR MANUFACTURING SUBSTRATE FOR MAGNETIC DISK

Номер: US20210005220A1
Автор: TAKANO Masao
Принадлежит:

The area of a spacer that is to be provided between the adjacent substrates in a laminate including a plurality of substrates to keep the adjacent substrates apart from each other is smaller than those of the stacked substrates. When pressure is released to bring the laminate obtained by providing the spacers between the substrates from a pressed state in which 0.60 MPa of pressure is applied to the laminate in the stacking direction into a non-pressed state, an amount of change ΔW in thickness per spacer that is calculated from a change in the thickness of the laminate due to the release of pressure is 30 μm or less. 1. A sheet-like spacer to be used when a laminate of a plurality of substrates is formed for the purpose of processing end faces of the substrates , the spacer being provided between the adjacent substrates in the laminate to keep the adjacent substrates apart from each other ,wherein an area of the spacer is smaller than that of the substrates, andwhen pressure is released to bring the laminate obtained by providing the spacers between the substrates from a pressed state in which 0.60 MPa of pressure is applied to the laminate in a stacking direction into a non-pressed state, an amount of change ΔW in thickness per spacer that is calculated from a change in the thickness of the laminate due to the release of pressure is 30 μm or less.2. The spacer according to claim 1 , which is made of resin.3. The spacer according to claim 1 , which has a surface roughness Ra of 0.2 μm or more.4. The spacer according to claim 1 , which is water-resistant.5. A laminate comprising:a plurality of substrates; and{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the spacer according to provided between the adjacent substrates of the plurality of substrates.'}6. A method for manufacturing a substrate claim 5 , comprising processing a side face of the laminate according to .7. A method for manufacturing a substrate claim 5 , comprising processing a side face of the ...

Подробнее
Номер записи: 97
04-01-2018 дата публикации

ANTI-REFLECTION DATA STORAGE MEDIUM

Номер: US20180005658A1
Автор: Gan Swee Chuan, Liu Xiong, ZHANG Li Hong
Принадлежит:

An anti-reflection storage medium. The anti-reflection storage medium includes a storage layer and a protective overcoat disposed over the storage later. The protective overcoat has a first refractive index value that is matched to a second refractive index value of the storage layer to reduce reflection of incident light applied to the storage medium when data is written to the storage layer of the storage medium. 1. An anti-reflection storage medium comprising:a storage layer; anda protective overcoat disposed over the storage layer,wherein the protective overcoat comprises a first refractive index value that is matched to a second refractive index value of the storage layer to reduce reflection of incident light applied to the storage medium when data is written to the storage layer of the storage medium.2. The anti-reflection storage medium of and further comprising a lubricant layer over the protective overcoat claim 1 , wherein the lubricant layer comprises a third refractive index value that is lower than the first refractive index value.3. The anti-reflection storage medium of and wherein the second refractive index value is greater than the first refractive index value.3. The anti-reflection storage medium of and wherein the protective overcoat comprises an amorphous carbon layer.4. The anti-reflection storage medium of and wherein the amorphous carbon overcoat comprises foreign atoms of at least one of H claim 3 , Si claim 3 , N claim 3 , F or transition metals comprising at least one of Cr claim 3 , Au claim 3 , Si or Pd.5. The anti-reflection storage medium of and wherein the carbon atoms of the amorphous carbon layer and the foreign atoms are bonded together in at least one of sp3 hybridization configurations or sp2 hybridization configurations.6. The anti-reflection storage medium of and wherein the foreign atoms incorporated into the amorphous carbon overcoat are in an unbonded state in the amorphous carbon overcoat.7. The anti-reflection storage ...

Подробнее
Номер записи: 98
04-01-2018 дата публикации

IRON-BASED OXIDE MAGNETIC PARTICLE POWDER, METHOD FOR PRODUCING SAME, COATING MATERIAL, AND MAGNETIC RECORDING MEDIUM

Номер: US20180005737A1
Автор: KAWAHITO Tetsuya, SAKANE Kenji
Принадлежит:

An iron-based oxide magnetic particle powder has a narrow particle size distribution a small content of fine particles that do not contribute to magnetic recording characteristics, and a narrow coercive force distribution, to enhance magnetic recording medium density. Neutralizing an aqueous solution containing a trivalent iron ion and an ion of the metal substituting a part of the Fe sites by adding an alkali to make pH of 1.5 or more and 2.5 or less, adding a hydroxycarboxylic acid, and further neutralizing by adding an alkali to make pH of 8.0 or more and 9.0 or less are performed at 5° C. or more and 25° C. or less. A formed iron oxyhydroxide precipitate containing the substituting metal element is rinsed with water, then coated with silicon oxide, and then heated thereby providing e-type iron-based oxide magnetic particle powder. The rinsed precipitate may be subjected to a hydrothermal treatment. 1. An iron-based oxide magnetic particle powder comprising ε-FeOhaving an average particle diameter measured with a transmission electron microscope of 10 nm or more and 30 nm or less , a part of Fe sites of which is substituted by another metal element , the iron-based oxide magnetic particle powder having a value of I/Idefined below of 0.7 or less and a value of α/εdefined below of 0.1 or less ,{'sub': H', 'L, 'sup': '2', 'wherein Irepresents an intensity of a peak present on a high magnetic field side in a differential B-H curve obtained by numerical differential of a B-H curve obtained by measuring under conditions of an applied magnetic field of 1,035 kA/m (13 kOe), an M measurement range of 0.005 A·m(5 emu), a step bit of 80 bit, a time constant of 0.03 sec, and a wait time of 0.1 sec; and Irepresents an intensity of an intercept of an ordinate at zero magnetic field in the differential B-H curve, and'}{'sub': s', 's, 'αrepresents a maximum value of a diffraction intensity except for background in X-ray diffractometry at 2θ of 27.2° or more and 29.7° or less; ...

Подробнее
Номер записи: 99
02-01-2020 дата публикации

Magnetic tape apparatus

Номер: US20200005818A1
Автор: Atsushi Musha, Eiki OZAWA, Norihito KASADA
Принадлежит: Fujifilm Corp

A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which 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, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, and 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.

Подробнее
Номер записи: 100