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

MAGNETPLATTENGERÄT UND SEIN HERSTELLUNGSVERFAHREN

Magnetlegierung und seiner Herstellungsverfahren

MAGNETIC RECORDING MEDIUM

Verfahren zur Herstellung eines magnetischen Aufzeichnungsträgers

SYNTHETISCHES GLEITMITTEL ZUM GLEITENDMACHEN EINES DUENNFILMES UND MAGNETISCHER AUFZEICHNUNGSTRAEGER.

Magnetooptisches Speichermedium.

Magnetischer Aufzeichnungsträger mit hoher Aufzeichnungsdichte.

MAGNETIC RECORDING TAPE

Magnetisches Aufzeichnungsmedium

METHOD OF FABRICATING METALLIC MAGNETIC TAPE

Magnetischer Aufzeichnungsträger.

TRAEGERFOLIE FUER MAGNETISCHE INFORMATIONSTRAEGER UND DEREN HERSTELLUNG.

Magnetisches Aufzeichnungsmedium mit feinkörnigen magnetischen Kristallen und seiner Herstellung

A MAGNETIC RECORDING MEDIUM

MAGNETISCHES AUFZEICHNUNGSMEDIUM

Magnetic recording medium allowing head suspension distance to be reduced for hard disc scanning

A magnetic recording medium consists of a magnetic layer, possibly with an underlayer on a non-magnetic substrate which, under irradiation from an energy beam forms protrusions of a height between 1 and 60 nm at a density of from 10 squared to 10 to the power of 8 per square mm on the surface. The useful dimensions are of height in the region 10 to 60 nm, at a density of 10 cubed to 10 to the power of 8 per square mm. A recess area may also be formed between protrusions by suitable use of the energy beam.

LAMINATED FILM AND MAGNETIC RECORDING MEDIUM MADE THEREWITH

PROTECTIVE COVERING FOR MAGNETIC RECORDING MEDIUM

MAGNETISCHES AUFZEICHNUNGSMEDIUM

Senkrechtes magnetisches Aufzeichnungsmittel und Informationsspeichergerät

MAGNETIC RECORDING MEDIUM

Improvements in and relating to magnetic record carriers

A magnetic record-carrier consists of a strip of a permanent magnet alloy comprising 15-50 per cent of nickel, 5-55 per cent of iron, and 30-75 per cent of copper, with or without up to 5 per cent of aluminium and up to 15 per cent of cobalt. The alloy after casting or rolling is cooled slowly from 1050 to 400 DEG C. or quenched, tempered at 400-800 DEG C. and rolled to form a thin band which may be less than 0,02 mm. thick. Reference has been directed by the Comptroller to Specifications 395,720 and 471,577.

PROCESS FOR PREPARING SUPPORTED PERMANENTLY-MAGNETIZABLE METALS OR ALLOYS

... 1,261,399. Magnetic compositions. STAMICARBON N.V. 9 April, 1969 [9 April, 1968 (2)], No. 18245/69. Heading H1H. [Also in Divisions C1 and C7] Supported permanently magnetizable metal (s) or alloy(s) are produced by suspending a finelydivided carrier material in a solution containing the metal ions and gradually generating OH1 ions homogeneously in the solution at a sufficient rate to deposit the active element(s) on the carrier but not fast enough to get nucleation of the pure precipitate in the solution, the precipitate being hydroxide or hydrated oxide, removing the carrier from the solution and then reducing the precipitate to give metal or alloy particles of size in the single-domain range. The reduction may be by means of hydrogen, optionally in the presence of water vapour, or by hydrazine and the precipitate may be calcined in air before reduction. The loaded carrier materials may be impregnated under vacuum with a polymerizable monomer or molten polymer for application ...

Magnetic disc

A magnetic disc wherein a shielding layer (22) is provided between a recording layer (3) for recording data therein and a substrate (2) to shield electromagnetic waves generated from a magnetic head (6) which records/regenerates data in/from said recording layer (3). The shielding layer may be formed of either a magnetic or non-magnetic material such as permalloy or Ni-P alloy respectively. ...

Data storage medium for storing data as a polarization of a data magnetic field and method and apparatus using spin-polarized electrons for storing the data

Ultrathin protective overcoats for magnetic materials

Magnetic media patterning utilizing heat-induced phase transition

Magneto-optical recording material

A magneto-optical recording material is disclosed, which consists of magnetoplumbite type ferrite containing barium in which part of Ba is replaced by La and part of Fe is replaced by Co.

Bicrystal cluster magnetic recording medium

FERROMAGNETIC METALLIC POWDERS USEFUL FOR MAGNETIC RECORDING AND PROCESSES FOR PRODUCING SAID METALLIC POWDERS

Ferromagnetic metallic powders useful for magnetic recording and processes for producing said metallic powders

Ferromagnetic Fe-Ni alloy powders having the combination of a coercive force of 550-900 Oe (oersted) and a saturation flux density of 90-170 emu/g are provided by applying a nickel compound in a liquid to a particulate, oxygen-containing iron compound having an average particle length of 0.5-5 mu m and an average particle width of 0.02-0.5 mu m, and then drying and reducing the treated material to produce a metallic powder. The ferromagnetic powders are suitable for production of magnetic recording media because of the balanced magnetic properties.

Object reconstruction on object oriented data storage device

Magnetic recording medium

A magnetic recording medium comprising a substrate, a thin magnetic metal film having spaced-apart columnar grains deposited on the substrate, and a crosslinked organic polymer formed from a polymerizable organic compound and a curing agent in the spaces between the columnar grains and integrated therewith. The medium is prepared by impregnating the spaces between the columnar grains with a polymerizable organic compound and a curing agent and curing them in the spaces by the crosslinking reaction.

Magnetic recording medium

A magnetic recording medium having a thin magnetic metal film on a non-magnetic base is disclosed. A surface layer is formed on either the thin magnetic metal film or the other side of the base or both by irradiating a coating of a polymer having an unsaturated bond polymerizable by radiation. A process for producing such magnetic recording medium is also disclosed.

Magnetic recording medium and method for producing the same

A magnetic recording medium comprises in combination a supporting member, a ferromagnetic thin film formed on one surface side of said supporting member, and a back layer provided on the other surface side of the supporting member The back layer is composed of filler material dispersed in a binder containing a radiation-sensitive curable resin, and then cured. ...

MAGNETIC RECORDING MEDIUM

RECORDING MEDIUM

MAGNETIC RECORDING MEDIUM

Improvements relating to the recording of sound

... 394,810. Sound-records. PFLEUMER, F., 44, Bodenbacher Strasse, Dresden, Germany. June 13, 1932, No. 16662. Convention date, June 12, 1931. [Class 40 (ii).] Magnetic sound records comprising metal powder applied to a carrier strip are made by dusting steel powder, or an iron powder prepared as described in Specification 333,154, [Class 40 (ii), Phonographs &c.], on to a carrier coated with an adhesive and then passing the carrier between a pair of heated pressing rolls driven at different speeds so that the metalled surface is smoothed by friction and the particles pressed close together. A varnish may then be applied. Specification 340,705 also is referred to.

IMPROVEMENTS IN OR RELATING TO METHODS OF AND APPARATUS FOR MANUFACTURING MAGNETIC STORAGE DISCS

... 1,222,720. Laminates; moulding plastic substances. INTERNATIONAL BUSINESS MACHINES CORP. 12 Nov., 1968 [11 Dec., 1967], No. 53518/68. Headings B5A and B5N. [Also in Division H1] A magnetic storage disc is made by moulding a carrier from a thermosetting plastic and a filler in a die having at least one flat surface, forming a magnetic coating on the flat surface, testing the coating for defects, and pressing it on to the pre-formed carrier. The flat surfaces may consist of removable glass or " hard metal " (e.g. tungsten carbide) rings, which are inserted in the die body after coating with magnetic material and a parting compound. The step of forming the magnetic coating on the die surface may take the form of inserting in the die a magnetically coated plastics substrate. Specified magnetic coatings are Fe 2 O 3 and Co-Ni alloy, while the carrier may be formed of epoxy-resin filled with glass fibre or paper. In one embodiment, a die 1a, 1b is provided with polished rings 2a, 2b retained ...

Magnetic recording media

A magnetic recording medium suitable for use in a recording system employing a magnetic recording transducer or head of the single-pole type which operates in a perpendicular magnetization mode comprises a non-magnetic base supporting a layer of low coercive force material formed on the base and which underlies a magnetic recording layer. The magnetic recording layer which faces the magnetic recording transducer or head is formed of an alloy composed mainly of chromium and cobalt and has an easy axis of magnetization perpendicular to the surface of the magnetic recording layer, with the thickness of the latter being no greater than 3.0 microns. The low coercive force material layer has a coercive force no greater than 1/5 of the coercive force of the magnetic recording layer, and the thickness of the low coercive force layer is greater than 0.1 microns.

METHOD OF FORMING IRON OXIDE FILMS

... 1492164 Depositing iron oxide films INTERNATIONAL BUSINESS MACHINES CORP 16 Feb 1976 [16 April 1975] 05940/76 Heading C7F In a process for forming films of Fe 3 O 4 Fe 2 O 3 or ferrites, a substrate is first coated with Cr or V, and then coated with iron oxide, which deposits in one of the above forms. The coatings are preferably produced by RF sputtering or electtron beam vaporization. The Cr or V layers form along (110) planes in which two-cell by three-cell arrays have an approximately square configuration of a size approximating to the lattice parameters of Fe 3 O 4 and Fe 2 O 3 , thus favouring deposition of the oxide in the desired form. Reactive sputtering of Fe in oxygen may also be used. In Examples, 1000 Š layers of Fe 3 O 4 were RF sputtered on to borosilicate glass substrates which had been coated with 2000 Š layers of Cr by RF sputtering (Ex 1) or evaporation (Ex 3), or V by sputtering (Ex 2) or evaporation (Ex 4). The substrates were held at 200‹C during coating. For oxide ...

PROTECTION OF A RECORDING MEDIUM

... 1520251 Protecting magnetic recording media EMI Ltd 14 July 1975 [13 July 1974] 31144/74 Heading B8M A recording device comprises reels 11 and 12 having hubs 13 and 15 which are preferably made of zinc or magnesium based alloys, a metal magnetic recording tape 2, preferably made of "VICALLOY" (Registered Trade Mark) which is an alloy of iron, cobalt, vanadium elements and supported on the reels 11, 12 in contact with the hubs 13, 15 by having their ends attached in. angled slots 16, whereby when the tape 2 and the reels 11, 12 are immersed in an electrolytic medium such as sea-water the hubs 13, 15 being of higher electropositive material relative to the material of the tape 2 act as a sacrificial electrode, thereby delaying the corrosion of the tape 2. The device is used in the "black box" of an aircraft. The hubs 13, 15 may be made of different materials provided they are more electropositive than the material of the tape 2. The hubs can be protected against too rapid dissolution by covering ...

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

MORE MAGNETOGRAMMTRAGER TO THE NOT UNNOTICED OTHER-CASH RECORDING OF MAGNETIC SIGNALS AND PROCEDURES FOR THE PRODUCTION OF SUCH RECORDINGS

MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION

MAGNETIC MEDIUM FOR THE STORAGE OF INFORMATION

AMORPHOUS MAGNETOOPTIC RECORDING CARRIER.

AMORPHOUS MAGNETOOPTIC MEMORY ELEMENT.

MAGNETIC RECORDING MEDIUM.

NANO-MAGNETIC MATERIALS

Procedure and device for the continuous separation of a layer of a magnet metal or a Magnetlegierung on the surface of a non conductive volume

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

DURATION MAGNET THIN SECTION AND HESTELLUNGSVERFAHREN

AMORPHOUS MAGNETO OPTICAL RECORDING MEDIUM

MAGNETO OPTICAL RECORDING MEDIUM

PROCESSING SCHEME FOR DOMAIN EXPANSION ROM MEDIA

Magnetic materials

MAGNETO-OPTICAL RECORDING MEDIUM

Method and apparatus for storing data using spin-polarized electrons

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCING THE SAME

MAGNETIC RECORDING MEDIUM AND PROCESS FOR PRODUCTION THEREOF

MAGNETIC RECORDING MEDIUM AND PRODUCTION PROCESSES THEREOF

MAGNETIC RECORDING MEDIUM AND PRODUCTION PROCESSES THEREOF A magnetic recording medium having an excellent resistance to wear and CSS strength and showing a satisfactory lubricant retention, and processes for production thereof. The magnetic recording medium includes a substrate having formed thereon, in sequence, a magnetic recording layer, a protective coating, and a lubricant coating, the protective coating including a plane portion and a plurality of fine projections and recesses formed on the plane portion.

AMORPHOUS MAGNETO OPTICAL RECORDING MEDIUM

AMORPHOUS MAGNETO OPTICAL RECORDING MEDIUM A magneto optical thin film recording medium is disclosed having very high carrier-to-noise ratios and high rotation angles. A transmission electron microscope photomicrograph (at 200,000 X) of one such medium is shown in Figure 1. These are multi-phase amorphous materials having magnetic anisotropy perpendicular to the plane of the thin film. They are produced in a triode vacuum sputtering process at vacuums in the range of 4 x 10-3 to 6 x 10-4 Torr. By adjusting process parameters such as substrate temperature, anode bias and deposition rate, the properties of the thin film can be altered.

VERTICAL MAGNETIC RECORDING MEDIUM AND PROCESS FOR PREPARATION THEREOF

VERTICAL MAGNETIC RECORDING MEDIUM AND PROCESS FOR PREPARATION THEREOF A vertical magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and having a magnetic anisotropy in the direction vertical to the surface of the substrate is described. The magnetic layer is composed substantially of a metal selected from cobalt and/or iron, and an oxide of the metal. The metal and metal oxide consist of columnar structures oriented in the direction vertical to the surface of the substrate and spaced from one another through fine voids throughout the magnetic layer. The columnar structures have a diameter of 100 to 1000 .ANG. and the magnetic layer have a void ratio of to 56%. The vertical magnetic recording medium is prepared by a process for vacuum-depositing a metal selected from cobalt and iron to form a magnetic layer on a substrate, wherein an oxygen gas and at least one gas chemically inactive in the vacuum deposition system, which is selected from nitrogen ...

SURFACE LUBRICANTS FOR RECORDING SURFACE

Magnetic recording media wherein the record surface is coated with an isocyanate lubricant (and, preferably, a supercoat of like lubricant), such lubrication being adapted to inhibit spin-off and like depletion, despite frequent head contact, while exhibiting good durability, wear resistance and recording characteristics over extended life (computer applications). M-199 ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCING THE SAME

Magnetic recording medium conventionally utilizes the in-plane magnetization mode, but, recently, the perpendicular magnetization mode utilizing the perpendicular anisotropy of an hcp cobalt alloy layer, in which C axis is oriented normal to the layer surface, is proposed. The known perpendicular magnetic recording medium has been produced by an RF sputtering, but such medium is of too low flexibility to use it in the form of a magnetic tape. In addition, the production rate of the perpendicular magnetic recording medium by RF sputtering is very low. The perpendicular magnetic recording medium is very flexible due to particle pattern (Figs. 10, 12 and 13) completely distinct from the conventional columnar pattern (Figs. 8 and 11). In addition, the production rate is high, because the base (20) is located beside a space between the targets (T1 , T2) of a sputtering device and further the magnetic field is generated perpendicularly to the sputtering surfaces (T1s , T2s) by a field coil (31 ...

AMORPHOUS MAGNETIC FILM

AMORPHOUS MAGNETIC-FILM A magnetic material of amorphous iron-nitride and a method for preparing the same are provided.

METHOD OF MAKING MAGNETIC RECORDINGS WHICH CANNOT BE ALTERED WITHOUT IT BEING NOTICED

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING REPRODUCER

A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer and a protective layer which are formed on the non-magnetic substrate in that order, wherein a substance(s) as a single component or a plurality of components, which constitute a liquid continuously supplied to the surface of said protective layer, are adsorbed on or react with the surface of said protective layer to form a lubricating film having low frictional properties and low wearing-out properties. The present invention can realize negligible friction and wear resistance even in severe sliding at a very slightly kept-off or completely contacted state by continuous supply of a liquid lubricant prepared by adding a fluoro compound and an extreme pressure agent ox an oiliness agent to a solvent to the surface of a disc, and can provide a magnetic recording reproducer having excellent sliding-resistant characteristics.

SUBSTRATE HAVING A CARBON RICH COATING

The present invention provides a magnetic recording medium that includes a polymeric flexible substrate and a magnetic layer costing thereon, with a binderless carbon rich layer adhered to the magnetic layer. The present invention also provides a process for the plasma deposition of the carbon rich coating onto a substrate comprising the steps of: a) providing a substrate in a vacuum chamber; b) generating carbon rich plasma in the vacuum chamber by injecting a plasma gas suitable to provide a carbon rich coating into an elongated hollow cathode; and providing a sufficient voltage to create ant maintain plasma; and maintaining a vacuum in the vacuum chamber sufficient for the plasma; and c) exposing the substrate to the plasma while the magnetic medium is influenced by a radio frequency bias electrode to accelerate the plasma toward the substrate and deposit the carbon rich coating on the substrate.

Tonträger für magnetische Aufzeichnungen.

Verfahren zur Herstellung von Stahldrähten oder Stahlbändern für magnetische Schallaufzeichnungen.

Verfahren zur Herstellung eines magnetisierbaren Tonträgers.

Tonträger.

Drahtförmiger magnetischer Aufzeichnungsträger.

Verfahren zum Nachweis des Vorhandenseins remanenter Magnetisierung an Geräteteilen von Magnettongeräten

Elément magnétique bistable et procédé pour sa fabrication

Pellicule mince magnétisable

Procédé pour le dépôt galvanique d'un revêtement au nickel et cobalt sur un métal de base en vue d'obtenir une pièce destinée à enregistrer les impulsions magnétiques, et pièce revêtue obtenue par ce procédé.

Verfahren und Vorrichtung zur Herstellung von Magnetaufzeichnungsmaterialien

Procedimento per la preparazione di pellicole magnetiche sottili

Magnetisches Aufzeichnungsverfahren

Mit Führungsrille versehener, folienförmiger Aufzeichnungsträger für Magnettondiktiergeräte

Magnetischer Aufzeichnungsträger

Procédé de fabrication de dispositifs magnétiques de mémoire

Composite soft underlayer including negative anisotropy material

An apparatus may include a composite soft underlayer and a perpendicular magnetic recording layer overlying the composite soft underlayer. The composite soft underlayer may include a growth template layer, a negative magnetic anisotropy layer overlying the growth template layer, and a magnetically soft layer overlying the negative magnetic anisotropy layer. In some embodiments, the negative magnetic anisotropy layer includes a plurality of grains, and substantially all the grains have negative magnetic anisotropy along an axis substantially perpendicular to a major plane of the composite soft underlayer. In some embodiments, the negative magnetic anisotropy layer includes a thickness of less than or equal to about 3 nm

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

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.

Hybrid Grain Boundary Additives in Granular Media

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 ...

Magnetization switching through magnonic spin transfer torque

The subject application describes systems and methods that drive magnetization switching through magnonic spin transfer torque. A spin current is provided to a first magnetic layer with a first magnetic state. The spin current facilitates magnetization switching via a magnonic spin transfer torque in a second magnetic layer with a second magnetic state that is separated from the first magnetic layer by an interface. Alternatively, a spin current is provided to a first magnetic domain with a first magnetic state. The spin current facilitates domain wall propagation via a magnonic spin transfer torque. The domain wall is between the first magnetic domain and a second magnetic domain in a second magnetic state.

FORMATION OF PATTERNED MEDIA BY SELECTIVE ANODIC REMOVAL FOLLOWED BY TARGETED TRENCH BACKFILL

A method is disclosed for defining discrete magnetic and non-magnetic regions on the magnetic film layer of a storage media substrate. The method applies anodic oxidation of a cobalt-containing magnetic film layer to remove cobalt, followed by controlled deposition of a non-magnetic matrix into the regions where the cobalt has been removed. Deposition may either be electrodeposition, collimated vacuum deposition, or other methods depending upon the composition of the non-magnetic matrix being deposited. The method may be performed in a single electrochemical cell. 112-. (canceled)13. A method for forming a patterned medium on a substrate comprising the steps of:{'sub': 2', '6', '3', '3', '4, 'selectively oxidizing a cobalt-containing magnetic film layer of the substrate in an electrochemical cell with an electrolyte solution comprising HPtCI, HBOand NHCI in order to remove at least a portion of cobalt from the cobalt-containing magnetic film layer; and'}depositing a non-magnetic matrix in the regions of the cobalt-containing magnetic film layer from where cobalt was selectively removed.14. The method of claim 13 , wherein the step of depositing the non-magnetic matrix comprises electrodeposition.15. The method of claim 13 , wherein the deposited non-magnetic matrix comprises a metal or alloy selected from the group consisting of platinum claim 13 , ruthenium claim 13 , nickel claim 13 , phosphorus and copper.16. The method of claim 13 , wherein the step of depositing non-magnetic matrix comprises vacuum deposition.17. The method of claim 16 , wherein the deposited non-magnetic matrix comprises a metal selected from the group consisting of chromium claim 16 , tantalum claim 16 , titanium claim 16 , nickel and copper.18. The method of claim 13 , wherein the selectively oxidizing and depositing steps are performed in a same electrochemical cell.19. An electrochemical cell comprising:{'sub': 2', '6', '3', '3', '4, 'an electrolyte solution of HPtCI, HBOand NHCI at a pH ...

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

Disclosed is a magnetic recording medium having a structure in which at least an underlayer, a first magnetic layer and a second magnetic layer are sequentially stacked on a substrate, wherein the first magnetic layer includes an alloy having an L1structure as a main component, and wherein the second magnetic layer includes a non-crystalline alloy including Co as a main component and containing Zr of 6 to 16 atomic percent and at least one element of B and Ta. 1. A magnetic recording medium having a structure in which at least an underlayer , a first magnetic layer and a second magnetic layer are sequentially stacked on a substrate ,{'sub': '0', 'wherein the first magnetic layer includes an alloy having an L1structure as a main component, and'}wherein the second magnetic layer includes a non-crystalline alloy containing Co as a main component and containing Zr of 6 to 16 atomic percent and at least one element of B and Ta.2. The magnetic recording medium according to claim 1 ,wherein the second magnetic layer includes a non-crystalline alloy of CoZrB, and B contained in the non-crystalline alloy is 6 to 16 atomic percent.3. The magnetic recording medium according to claim 2 ,wherein the sum of Zr and B contained in the non-crystalline alloy is 16 to 28 atomic percent.4. The magnetic recording medium according to claim 1 ,wherein the second magnetic layer includes a non-crystalline alloy of CoZrTa, and Ta contained in the non-crystalline alloy is 6 to 16 atomic percent.5. The magnetic recording medium according to claim 4 ,wherein the sum of Zr and Ta contained in the non-crystalline alloy is 16 to 28 atomic percent.6. The magnetic recording medium according to claim 1 ,{'sub': 0', '2', '2', '2', '3', '2', '3', '2', '5', '2', '2', '3', '2', '2', '3, 'wherein the first magnetic layer includes FePt or CoPt alloy having the L1structure as the main component, and contains at least one or more of SiO, TiO, CrO, AlO, TaO, ZrO, YO, CeO, MnO, TiO, ZnO, C, BOand BN.'}7. The ...

MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF THE SAME

A magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced. The magnetic recording medium has a magnetic recording layer of a granular structure having nonmagnetic boundary portions between pillar-shaped magnetic particles on a nonmagnetic substrate, and an exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles. Ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer is performed 1. A magnetic recording medium comprising:a non-magnetic substrate;a magnetic recording layer of a granular structure, where pillar-shaped magnetic particles spatially have nonmagnetic boundary portions therebetween, on the nonmagnetic substrate; andan exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles,wherein reversed magnetic domain nucleation magnetic field Hn is −2000Oe or more, a ratio Hn/Hc of reversed magnetic domain nucleation magnetic field Hn to coercive force Hc is −0.5 or less, and a film thickness of the exchange coupling layer is 7 nm or less.2. The magnetic recording medium according to claim 1 , wherein the exchange coupling layer contains Pt claim 1 , Co and Cr.3. The magnetic recording medium according to claim 1 , wherein a thickness of the exchange coupling layer is nm or less4. The magnetic recording medium according to claim 1 , wherein said exchange coupling layer being a film containing a metal having a hexagonal closed packed structure and providing an exchange coupling layer surface.5. The magnetic recording medium according to claim 1 , wherein said exchange coupling layer has been subject to ion irradiation.6. The magnetic recording medium according to claim 5 , wherein an amount of change in a ratio c/a of a c-axis to an a-axis in a crystal lattice of ...

Soft Magnetic Alloy for Magnetic Recording Medium, Sputtering Target Material, and Magnetic Recording Medium

There is provided a soft magnetic alloy for a perpendicular magnetic recording medium having a low coercive force, high amorphous properties, high corrosion resistance, and a high hardness; and a sputtering target for producing a thin film of the alloy. The alloy comprises in at. %: 6 to 20% in total of one or two of Zr and Hf; 1 to 20% of B; and 0 to 7% in total of one or two or more of Ti, V, Nb, Ta, Cr, Mo, W, Ni, Al, Si, and P; and the balance Co and/or Fe and unavoidable impurities. The alloy further satisfies 6≦2×(Zr%+Hf%)−B%≦16 and 0≦Fe%/(Fe%+Co%)<0.20. 1. A soft magnetic alloy for a magnetic recording medium comprising in at. %:one or two of Zr and Hf: 6 to 20% in total;B: 1 to 20%; andone or two or more of Ti, V, Nb, Ta, Cr, Mo, W, Ni, Al, Si, and P: 0 to 7% in total; and [{'br': None, '6≦2×(Zr%+Hf%)−B%≦16;'}, {'br': None, 'and'}, {'br': None, '0≦Fe%/(Fe%+Co%)<0.20.'}], 'the balance Co and/or Fe and unavoidable impurities, and satisfying formulae below2. The alloy according to claim 1 , consisting of in at. %:one or two of Zr and Hf: 6 to 20% in total;B: 1 to 20%; andone or two or more of Ti, V, Nb, Ta, Cr, Mo, W, Ni, Al, Si, and P: 0 to 7% in total; andthe balance Co and/or Fe and unavoidable impurities.3. The alloy according to claim 1 , {'br': None, '0 Подробнее

Exchange Coupled Magnetic Elements

Approaches to reduce switching field distribution in energy assisted magnetic storage devices involve first and second exchange coupled magnetic elements. The first magnetic elements have anisotropy, H, volume, Vand the second magnetic elements are magnetically exchange coupled to the first magnetic elements and have anisotropy H, and volume V. The thermal stability of the exchange coupled magnetic elements is greater than about 60 kT at a storage temperature of about 300 K. The magnetic switching field distribution, SFD, of the exchange coupled magnetic elements is less than about 200% at a predetermined magnetic switching field and a predetermined assisting switching energy. 1. A magnetic storage article , comprising:{'sub': k1', '1, 'first magnetic elements having anisotropy, H, volume, V; and'}{'sub': k2', '2', 'B, 'second magnetic elements magnetically exchange coupled to the first magnetic elements, the second magnetic elements having anisotropy H, and volume V, wherein a thermal stability of the exchange coupled magnetic elements is greater than about 60 kT at a storage temperature of about 300 K and a magnetic switching field distribution, SFD, of the exchange coupled magnetic elements is less than about 200% at a predetermined magnetic switching field and a predetermined assisting switching energy.'}2. The article of claim 1 , wherein the assisting switching energy comprises thermal energy.3. The article of claim 1 , wherein the assisting switching energy comprises microwave magnetic energy.4. The article of claim 1 , wherein the magnetic storage article comprises heat assisted magnetic recording (HAMR) medium.5. The article of claim 1 , wherein the magnetic storage article is a microwave assisted magnetic recording (MAMR) medium.6. The article of claim 1 , wherein the magnetic storage article is magnetoresistive random access memory (MRAM).7. The article of claim 1 , wherein the magnetic storage article comprises a patterned medium.8. The magnetic article ...

Magnetic recording medium and magnetic storage apparatus

A magnetic recording medium may include an orientation control layer, a lower recording layer, an intermediate layer, and an upper recording layer that are stacked. The lower recording layer may have a coercivity higher than that of the upper recording layer, and the intermediate layer may include a layer including a magnetic material and having a saturation magnetization of 50 emu/cc or higher. The upper recording layer may include columnar crystals continuous with crystal particles forming the intermediate layer in a direction in which the layers are stacked.

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A magnetic recording medium may include a stacked structure of orientation control, lower recording, intermediate, and upper recording layers. The lower recording layer has a coercivity higher than that of the upper recording layer. The lower recording layer includes a first layer with a granular structure that includes magnetic particles including Co, Cr, and Pt, and an oxide covering a periphery of the magnetic particles, and a second layer with a non-granular structure that includes magnetic particles including Co, Cr, and Pt. The lower recording layer includes columnar crystals continuous with crystal particles forming the orientation control layer in a stacking direction of the stacked structure. 1. A magnetic recording medium comprising:a stacked structure including an orientation control layer, a lower recording layer, an intermediate layer, and an upper recording layer that are sequentially stacked,wherein the lower recording layer has a coercivity higher than that of the upper recording layer,the lower recording layer includes a first lower recording layer provided on a side of the orientation control layer, and a second lower recording layer provided on a side of the intermediate layer,the first lower recording layer has a granular structure that includes magnetic particles including Co, Cr, and Pt, and an oxide covering a periphery of the magnetic particles,the second lower recording layer has a non-granular structure that includes magnetic particles including Co, Cr, and Pt, andthe lower recording layer includes columnar crystals continuous with crystal particles forming the orientation control layer in a direction in which the layers of the stacked structure are sequentially stacked.2. The magnetic recording medium as claimed in claim 1 , wherein the oxide is formed by an alloy including two or more kinds of elements selected from a group consisting of Cr claim 1 , Si claim 1 , Ta claim 1 , Al claim 1 , Ti claim 1 , Mg claim 1 , and Co.3. The magnetic ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM

A perpendicular magnetic recording medium is disclosed. The perpendicular magnetic recording medium includes a first layer, and a second layer positioned immediately below the first layer. Among the materials in the first layer and the second layer, if the interface energy when two different materials—material a and material b—are in contact is defined as Ei(a//b), the surface energy when material a exists independently is defined as Es(a), and the energy resulting by subtracting the sum of the respective surface energies (ΣEs) from the interface energy is defined as G(a//b), then when G(1//3) Подробнее

Thin Film Structure with Controlled Lateral Thermal Spreading in the Thin Film

An apparatus includes a non-metallic interlayer between a magnetic data storage layer and a heat sink layer, wherein interface thermal resistance between the interlayer and the heat sink layer is capable of reducing heat flow between the heat sink layer and the magnetic data storage layer. The apparatus may be configured as a thin film structure arranged for data storage. The apparatus may also include thermal resistor layer positioned between the interlayer and the heat sink layer. 120-. (canceled)21. An apparatus , comprising:a magnetic data storage layer;a heat sink layer; andan interlayer between the magnetic data storage layer and the heat sink layer, the interlayer configured to facilitate a first heat flow from the magnetic data storage layer to the heat sink layer and a second heat flow from the heat sink layer to the magnetic data storage layer, wherein a rate of the first heat flow is greater than a rate of the second heat flow.22. The apparatus of claim 21 , wherein the interlayer comprises an oxide or a nitride.23. The apparatus of claim 21 , wherein the interlayer comprises a boride or a carbide.24. The apparatus of claim 21 , wherein the interlayer comprises an amorphous material.25. The apparatus of claim 21 , wherein the interlayer comprises a soft magnetic material.26. The apparatus of claim 21 , wherein the interlayer comprises at least one of AlO claim 21 , SiO claim 21 , WO claim 21 , TaO claim 21 , NbO claim 21 , ZrO claim 21 , SiN claim 21 , NiP claim 21 , TiN claim 21 , FeCoB claim 21 , CoZrNi claim 21 , and CoTaFe.27. The apparatus of claim 21 , wherein the interlayer comprises Ru or an Ru alloy.28. The apparatus of claim 21 , wherein:the interlayer comprises an oxide or a nitride; andthe heat sink layer comprises Au, Ag, AI, Cu, W, Ru, Cr, Mo, a Cu alloy, an Ag alloy or an Au alloy.29. The apparatus of claim 21 , wherein:the interlayer comprises an oxide or a nitride; andthe magnetic data storage layer comprises at least one of FePt, an FePt ...

PERPENDICULAR RECORDING MEDIUM WITH OXIDE GRADIENT LAYER

Apparatus for recording data and method for making the same. In accordance with some embodiments, a recording layer is supported by a substrate. The recording layer has a granular magnetic recording layer with a first oxide content, a continuous magnetic recording layer with nominally no oxide content, and an oxide gradient layer disposed between the respective granular magnetic recording layer and the continuous magnetic recording layer. The oxide gradient layer has a second oxide content less than the first oxide content of the granular layer. 1. An apparatus comprising:a substrate; anda recording layer supported by the substrate comprising a granular magnetic recording layer having a first oxide content, a continuous magnetic recording layer having nominally no oxide content, and an oxide gradient layer disposed between the respective granular magnetic recording layer and the continuous magnetic recording layer having a second oxide content less than the first oxide content of the granular layer.2. The apparatus of claim 1 , wherein the continuous magnetic recording layer is a continuous granular composite (CGC) layer.3. The apparatus of claim 1 , wherein the granular magnetic recording layer comprises a magnetic material claim 1 , a non-magnetic material and oxide claim 1 , wherein the oxide is about 15-30 vol %.4. The apparatus of claim 3 , wherein the oxide is about 20-25 vol %.5. The apparatus of claim 3 , wherein the oxide gradient layer comprises a magnetic material and oxide claim 3 , wherein the oxide is about 5-15 vol %.6. The apparatus of claim 5 , wherein the oxide is about 6-12 vol %.7. The apparatus of claim 5 , wherein the oxide is about 5-10 vol %.8. The apparatus of claim 1 , wherein the granular magnetic recording layer and the oxide gradient layer share a common elemental construction apart from different amounts of oxide in the respective layers.9. The apparatus of claim 1 , wherein the oxide gradient layer has a thickness significantly less ...

MAGNETIC SEED LAYER

An apparatus includes a disk substrate and a soft underlayer overlying the disk substrate. A magnetic seed layer overlies the soft underlayer, wherein the magnetic seed layer is formed by a hexagonal close-packed lattice material and has in-plane magnetic anisotropy. 1. An apparatus comprising:a substrate;a soft underlayer overlying said substrate; anda magnetic seed layer overlying said soft underlayer, wherein said magnetic seed layer is formed from a hexagonal close-packed crystalline structure, having longitudinal magnetization, and wherein said magnetic seed layer is permeable by magnetic flux.2. The apparatus of claim 1 , wherein a thickness of said magnetic seed layer ranges between 10-100 Å.3. The apparatus of claim 1 , wherein said magnetic seed layer comprises a plurality of growth layers claim 1 , wherein each growth layer of said plurality of growth layers is between 10-100 Å thick.4. The apparatus of claim 1 , wherein said magnetic seed layer and said soft underlayer are operable to pass magnetic flux in horizontal direction.5. The apparatus of claim 1 , wherein said soft underlayer is amorphous and has in-plane magnetic anisotropy.6. The apparatus of further comprising a magnetic base layer disposed above said magnetic seed layer.7. The apparatus of claim 1 , wherein said interlayer is operable to substantially prevent magnetic interactions between the soft underlayer and said magnetic seed layer and said magnetic base layer to optimize microstructural and magnetic properties of hard recording layer.8. An apparatus comprising:a magnetic base layer, wherein said magnetic base layer comprises a plurality of magnetic recording islands operable to magnetically align in response to a magnetic flux;a magnetic seed layer disposed below said magnetic base layer, wherein said magnetic seed layer is formed by a hexagonal close-packed lattice material, having in-plane magnetic anisotropy, and wherein said magnetic seed layer is operable to pass said magnetic flux ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM

A magnetic recording medium having a thick magnetic recording layer of excellent magnetic characteristics is provided. The magnetic recording medium includes a non-magnetic substrate and a magnetic recording layer. The magnetic recording layer includes a plurality of first magnetic recording layers located at odd-numbered positions from the non-magnetic substrate, and one or more second magnetic recording layers located at even-numbered positions from the non-magnetic substrate. The first magnetic recording layers each have a granular structure that has first magnetic crystal grains with an ordered alloy and a first non-magnetic portion surrounding the first magnetic crystal grains and formed of a material having carbon as main component. The second magnetic recording layers each have a granular structure that has second magnetic crystal grains with an ordered alloy and a second non-magnetic portion surrounding the second magnetic crystal grains and formed of a material different from that of the first non-magnetic portion. 1. A perpendicular magnetic recording medium , comprising:a non-magnetic substrate; and a plurality of first magnetic recording layers located at odd-numbered positions from the non-magnetic substrate and each first magnetic recording layer of the plurality of first magnetic recording layers having a granular structure that has first magnetic crystal grains with an ordered alloy and a first non-magnetic portion surrounding the first magnetic crystal grains and formed of a material having carbon as the main component; and', 'one or more second magnetic recording layers located at even-numbered positions from the non-magnetic substrate, each second magnetic recording layer of the one or more second magnetic recording layers having a granular structure that has second magnetic crystal grains with an ordered alloy and a second non-magnetic portion surrounding the second magnetic crystal grains and formed of a material different from that of the first ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM

According to one embodiment, a perpendicular magnetic recording medium includes an underlying layer with convexes arranged with 1 to 20 nm intervals, and a multilayered amorphous magnetic recording layer formed on the underlying layer. The multilayered amorphous magnetic recording layer includes a first amorphous magnetic recording layer with a plurality of magnetic grains each formed on a corresponding convex to be widened toward its tip and being separated from each other at least in the convex side, a nonmagnetic protective layer covering at least a part of a sidewall of the magnetic particle, and a second amorphous magnetic recording layer formed on the nonmagnetic protective layer. 1. A perpendicular magnetic recording medium comprising:a substrate;an underlying layer including a plurality of convexes arranged on the substrate with intervals of 1 to 20 nm; anda multilayered amorphous magnetic recording layer formed on the underlying layer,wherein the multilayered amorphous magnetic recording layer includes a plurality of magnetic grains, each of the magnetic grains formed on a surface of a corresponding convex of the underlying layer to be widened toward an end thereof and having a magnetization easy axis in a direction perpendicular to a layer surface,the magnetic grains are separated from each other at least in an area in the proximity of the convexes of the underlying layer, andeach of the magnetic particle includes a first amorphous magnetic recording layer, a nonmagnetic protective layer formed on the first amorphous magnetic recording layer to cover at least a part of a sidewall of the magnetic particle, and a second amorphous magnetic recording layer formed on the nonmagnetic protective layer.2. The perpendicular magnetic recording medium of claim 1 , wherein a combination of a nonmagnetic protective layer and an amorphous magnetic recording layer is additionally formed on the second amorphous magnetic recording layer claim 1 , and the number of the ...

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L1type crystal structure, and a plurality of underlayers arranged between the substrate and the magnetic layer. At least one of the plurality of underlayers is a soft magnetic underlayer formed by an alloy having a hexagonal close packed (hcp) structure and including Co metal or Co as its main component, with a (11•0) plane oriented parallel to a surface of the substrate. 1. A magnetic recording medium comprising:a substrate;{'sub': '0', 'a magnetic layer including an alloy having an L1type crystal structure; and'}a plurality of underlayers arranged between the substrate and the magnetic layer,wherein at least one of the plurality of underlayers is a soft magnetic underlayer formed by an alloy having a hexagonal close packed (hcp) structure and including Co metal or Co as its main component, with a (11•0) plane oriented parallel to a surface of the substrate.2. The magnetic recording medium as claimed in claim 1 , wherein the soft magnetic underlayer includes at least one kind of element selected from a group of elements consisting of Fe claim 1 , Ni claim 1 , Cr claim 1 , Mn claim 1 , V claim 1 , Ru claim 1 , Re claim 1 , Pt claim 1 , and Pd.3. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers include a predetermined underlayer formed by an alloy having a body centered cubic (bcc) structure and including Cr metal or Cr as its main component, andthe soft magnetic underlayer is formed on the predetermined underlayer.4. The magnetic recording medium as claimed in claim 3 , wherein the alloy of the predetermined underlayer includes at least one kind of element selected from a group of elements consisting of Mn claim 3 , V claim 3 , Ti claim 3 , Mo claim 3 , W claim 3 , Nb claim 3 , and Ru.5. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers include a predetermined underlayer formed by an NiAl ...

MAGNETIC RECORDING MEDIUM

The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more. 1. A magnetic recording medium comprising:a long substrate body; anda magnetic layer including a powder of cubic crystal ferrite magnetic particles,wherein a sum of a squareness ratio in a longitudinal direction and a squareness ratio in a vertical direction is 1.2 or more, and a difference of the squareness ratio in the longitudinal direct on and the squareness ratio in the vertical direction is 0.15 or more.2. The magnetic recording medium according to claim 1 , wherein the cubic crystal ferrite magnetic particles contain Co.3. The magnetic recording medium according to claim 2 , wherein the cubic crystal ferrite magnetic particles further contain. one or more kind selected from the group consisting of Ni claim 2 , Mn claim 2 , Al claim 2 , Cu and Zn.4. The magnetic recording medium according to claim 1 , wherein the sum of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 1.28 or more claim 1 , and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.26 or more.5. The magnetic recording medium according to claim 1 , wherein the powder of cubic crystal ferrite magnetic particles is oriented is the longitudinal direction.6. The magnetic recording medium according to claim 1 , wherein the cubic crystal ferrite magnetic particales each have a cubic shape or an approximately cubic shape.7. The magnetic recording medium according to claim 1 , wherein the magnetic layer is a vertical recording layer. The present technology relates to a ...

SPUTTERING TARGET FOR MAGNETIC RECORDING MEDIUM, AND MAGNETIC THIN FILM

Provided is a sputtering target or a film which is characterized by containing 0.1 to 10 mol % of an oxide of one or more types selected from FeO, FeO, KO, NaO, PbO, and ZnO, 5 to 70 mol % of Pt, and the remainder being Fe. The present invention addresses the issue of providing a sputtering target capable of considerably reducing the particles caused by nonmagnetic materials and significantly improving the yield during deposition. It is thereby possible to deposit a quality magnetic recording layer and improve yield of a magnetic recording medium. 1. A sputtering target comprising 0.1 to 5 mol % of one or more oxides selected from the group consisting of FeO , FeO , KO , NaO , PbO , and ZnO , 5 to 70 mol % of Pt , and the remainder being Fe.2. The sputtering target according to claim 1 , wherein the sputtering target contains an oxide of one or more elements or compounds selected from the group consisting of Al claim 1 , B claim 1 , Si claim 1 , Ti claim 1 , carbon claim 1 , boron claim 1 , boron nitride claim 1 , and boron carbide in a total amount of 1 to 50 mol %.3. The sputtering target according to claim 2 , wherein the sputtering target contains 1 to 30 mol % of one or more elements selected from the group consisting of Au claim 2 , Ag claim 2 , Cu claim 2 , Ga claim 2 , Ge claim 2 , Ir claim 2 , Mn claim 2 , Mo claim 2 , Nb claim 2 , Ni claim 2 , Pd claim 2 , Re claim 2 , Rh claim 2 , Ru claim 2 , Sn claim 2 , Ta claim 2 , W claim 2 , V claim 2 , and Zn.4. The sputtering target according to claim 3 , wherein an average area per nonmagnetic particle is 0.1 to 2000 μm.5. A film comprising 0.1 to 5 mol % of one or more oxides selected from the group consisting of FeO claim 3 , FeO claim 3 , KO claim 3 , NaO claim 3 , PbO claim 3 , and ZnO claim 3 , 5 to 70 mol % of Pt claim 3 , and the remainder being Fe.6. The film according to claim 5 , wherein the film contains an oxide of one or more elements or compounds selected from the group consisting of Al claim 5 , B ...

Granular media with a high-hk assist layer for microwave-assisted magnetic recording

In one embodiment, a magnetic storage device includes at least one microwave assisted magnetic recording (MAMR) head, each MAMR head including a spin torque oscillator (STO), a magnetic recording medium, a drive mechanism for passing the magnetic medium over the at least one MAMR head, and a controller electrically coupled to the at least one MAMR head for controlling operation of the at least one MAMR head, wherein the magnetic recording medium includes a recording layer positioned directly or indirectly above a substrate and an assist layer positioned above the recording layer, wherein the recording layer includes at least Co, Pt, and an oxide or oxygen, wherein the assist layer is positioned closer to the at least one MAMR head and includes at least Co and Pt, and wherein at least a portion of the recording layer has a smaller anisotropic magnetic field than the assist layer.

FERRIMAGNETIC PARTICLE POWDER AND METHOD OF MANUFACTURING FERRIMAGNETIC PARTICLE POWDER, AS WELL AS MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM

A magnetic recording medium includes: a substrate; and a magnetic layer including a ferrimagnetic particle powder. A product (V×SFD) of a particle volume V and a holding force distribution SFD of the ferrimagnetic particle is equal to or less than 2500 nm. 2. The method of manufacturing a ferrimagnetic particle powder according to claim 1 , wherein the temperature T [° C.] and the time t [h] of the heat treatment fall within a range defined by claim 1 , in addition to the formulas (1) to (5) claim 1 , formula (6) below:{'br': None, 'i': t=', 'T≦, '48[h](where 550[° C.]≦680[° C.])\u2003\u2003(6)'}3. The method of manufacturing a ferrimagnetic particle powder according to claim 1 , wherein a ratio of sodium borate to a total of the ferrimagnetic particle-forming substance and sodium borate is more than 30 mol % and less than 50 mol %.4. The method of manufacturing a ferrimagnetic particle powder according to claim 1 , wherein the ferrimagnetic particle-forming substance contains barium carbonate and iron oxide.5. The method of manufacturing a ferrimagnetic particle powder according to claim 4 , wherein the ferrimagnetic particle-forming substance further contains at least one selected from the group consisting of cobalt oxide claim 4 , zinc oxide claim 4 , and titanium oxide. The present application is a divisional application of U.S. patent application Ser. No. 14/901,884, filed on Dec. 29, 2015, which application is a national stage entry of PCT Application No. PCT/JP2014/003784, filed on Jul. 17, 2014, which application claims priority to Japanese Priority Patent Application JP 2013-173869, filed in the Japan Patent Office on Aug. 23, 2013, the entire content of which is hereby incorporated by reference.The present technology relates to a ferrimagnetic particle powder suitably used in a magnetic recording medium and a method of manufacturing the ferrimagnetic particle powder, as well as a magnetic recording medium including the ferrimagnetic particle powder and a ...

MAGNETIC RECORDING MEDIUM

A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·αδ(1−Rs)), Ms, and α satisfy (Ms·α·δ(1−Rs))≦0.1 [μ·emu·(mm)], Ms≧450 [emu/cc], and α≧1.2. In the above formulas, Ms indicates a saturated magnetization amount, α indicates the gradient of a M-H loop around a coercive force Hc, δ indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio. 1. A magnetic recording medium comprising:a substrate that is a flexible, non-magnetic material;a seed layer having an amorphous state and including an alloy containing Ti and Cr;an under layer including Ru, wherein the seed layer is between the substrate and the under layer, anda perpendicular recording layer having a granular structure formed on the under layer,{'sup': 1.5', '0.33, 'claim-text': [{'br': None, 'i': Ms·α·δ', 'Rs, 'sup': 1.5', '0.33', '−1.5, '((1−))≦0.1[μ·emu·(mm)],'}, {'br': None, 'i': 'Ms≧', '450[emu/cc], and'}, {'br': None, 'α≧1.2, and'}], 'wherein (Ms·α·δ(1−Rs)), Ms, and α satisfy the following relationswherein in the above formulas, Ms indicates a saturated magnetization amount, α indicates the gradient of a M-H loop around a coercive force Hc, δ indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.2. The magnetic recording medium according to claim 1 ,wherein the seed layer has an amorphous state and includes a metal having a melting point of 2,000° C. or less.3. (canceled)4. The magnetic recording medium according to claim 1 ,{'sub': 'B', 'claim-text': {'br': None, 'i': Ku·V/k', '·T, 'sub': 'B', '()≧65, and'}, 'wherein (Ku·V/k·T) satisfies the following relation{'sub': 'B', 'wherein in the above formula, Ku indicates magnetic anisotropy energy, V indicates an activation volume, kindicates Boltzmann constant, and T indicates the absolute temperature.'}5. (canceled)6. The magnetic recording medium according to claim 1 ,wherein the ...

MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer. 1. A magnetic recording device , comprising:a magnetic head; anda magnetic recording medium, information being recorded in the magnetic recording medium by the magnetic head, a magnetic pole;', 'a first shield;', 'a first magnetic layer provided between the magnetic pole and the first shield;', 'a second magnetic layer provided between the first magnetic layer and the first shield; and', 'an intermediate layer provided between the first magnetic layer and the second magnetic layer, the intermediate layer being nonmagnetic,', 'a first distance between the magnetic pole and the first magnetic layer along a first direction being not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction, the first direction being from the first magnetic layer toward the second magnetic layer,, 'wherein the magnetic head compriseswherein a shortest bit length of the magnetic recording medium is not less than 0.5 times and not more than 0.78 times a third distance between the first magnetic layer and the first shield along the first direction.2. The magnetic device according to claim 1 , wherein the first distance is not less than 1 nm and not more than 4 nm.3. The magnetic device according to claim 1 , further ...

MAGNET ALTERNATING POLE ARRAY MAGNETIZED BY ONE SIDE MAGNETIZATION TO BOOST MAGNETIC ATTRACTION FORCE

A flexible magnetic component can include a magnetizable powder including a rare earth element. The flexible magnetic component can also include a polymer binder. The flexible magnetic component can define a first surface and a second surface opposite the first surface. A first magnetic field adjacent to the first surface can have a field strength at least 3 times greater than a field strength of a second magnetic field adjacent to the second surface, and the flexible magnetic component can elongate greater than 20% before a permanent deformation occurs. 1. A flexible magnetic component , comprising:a magnetizable powder comprising a rare earth element; anda polymer binder;wherein the flexible magnetic component has a first magnetic field strength adjacent to a first surface of the flexible magnetic component at least 3 times greater than a second magnetic field strength adjacent to a second surface of the flexible magnetic component opposite the first surface.2. The flexible magnetic component of claim 1 , wherein the first magnetic field strength is at least 4 times greater than the second magnetic field strength.3. The flexible magnetic component of claim 1 , wherein the flexible magnetic component can elongate greater than 20% without plastic deformation4. The flexible magnetic component of claim 1 , wherein the polymer binder comprises at least one of a nitrile butadiene rubber material claim 1 , a silicone material claim 1 , or a fluoroelastomer material.5. The flexible magnetic component of claim 1 , wherein the magnetizable powder comprises neodymium.6. The flexible magnetic component of claim 1 , wherein the flexible magnetic component has a density of between 5 grams per cubic centimeter (g/cm) and 6.5 g/cm.7. The flexible magnetic component of claim 1 , further comprising:a first portion having a first magnetic polarity;a second portion disposed adjacent to the first portion, the second portion having a magnetic polarity that is opposite the first ...

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

According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed on a substrate and including magnetic grains and a grain boundary formed between the magnetic grains, the grain boundary includes a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first and second grain boundaries suppresses thermal conduction. 1. A magnetic recording medium comprising:a substrate; anda magnetic recording layer formed on the substrate, and comprising magnetic grains and a grain boundary formed between the magnetic grains,wherein the grain boundary comprises a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first grain boundary and the second grain boundary is configured to suppress thermal conduction.2. The medium of claim 1 , further comprising a heat-sink layer between the substrate and the magnetic recording layer.3. The medium of claim 2 , wherein the heat-sink layer contains at least one material selected from the group consisting of silver claim 2 , copper claim 2 , gold claim 2 , and alloys thereof.4. The medium of claim 2 , further comprising a thermal barrier layer between the heat-sink layer and the magnetic recording layer.5. The medium of claim 4 , wherein the thermal barrier layer contains ZrO.6. The medium of claim 1 , wherein the magnetic grains are selected from the group consisting of an iron-platinum alloy having an L1structure claim 1 , a cobalt-platinum alloy having the L1structure claim 1 , and a multilayered film of cobalt and platinum.7. The medium of claim 1 , wherein each of the first grain boundary and the second grain boundary is selected from a layer made of at ...

Magnetic recording medium

A magnetic recording medium includes: a flexible and elongated substrate; a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less; and a recording layer, in which the soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

A thermally-assisted magnetic recording medium or a microwave-assisted magnetic recording medium includes: an orientation control layer () that is formed on a substrate (); an underlayer () that is formed on the orientation control layer (); and a magnetic layer () that is formed on the underlayer () and contains an alloy having an L1type crystal structure as a main component, in which the underlayer () includes an MgO underlayer () that contains MgO and has a (100) orientation and a nitride underlayer () that contains at least one nitride selected from the group consisting of TaN, NbN, and HfN and has a (100) orientation. 1. A magnetic recording medium , comprising:an orientation control layer that is formed on a substrate;an underlayer that is formed on the orientation control layer; and{'sub': '0', 'a magnetic layer that is formed on the underlayer and contains an alloy having an L1type crystal structure as a main component,'}wherein the underlayer includes an MgO underlayer that contains MgO and has a (100) orientation and a nitride underlayer that contains at least one nitride selected from the group consisting of TaN, NbN, and HfN and has a (100) orientation, andrecording is performed by using thermally-assisted magnetic recording method or microwave-assisted magnetic recording method.2. The magnetic recording medium according to claim 1 ,wherein the MgO underlayer is formed on the nitride underlayer.3. The magnetic recording medium according to claim 1 ,wherein the nitride underlayer is formed on the MgO underlayer.4. The magnetic recording medium according to claim 1 ,wherein the orientation control layer includes a (100)-oriented BCC underlayer that contains Cr, Mo, Nb, Ta, V, W, or Cr as a main component and has a BCC structure containing at least one element selected from the group consisting of Mn, Mo, Ru, Ti, V, and W.5. The magnetic recording medium according to claim 1 ,wherein the orientation control layer includes a B2 underlayer that has a B2 ...

COMPOSITE HAMR MEDIA STRUCTURE FOR HIGH AREAL DENSITY

A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer. 1. An apparatus comprising a data storage medium having an exchange coupled composite (ECC) structure comprising a coupling layer (ECL) contacting and disposed between a storage layer and a write layer , the storage layer having a lower Curie temperature and a higher anisotropy than the respective ECL and write layers , the ECL coupling the write layer to the storage layer with a coupling strength from 0.1 Jex/Jo to 0.6 Jex/Jo.2. The apparatus of claim 1 , wherein the coupling strength is tuned with respect to a grain size of the storage layer and a data track width where data bits of the data storage medium are stored.3. The apparatus of claim 1 , wherein a write temperature for the ECC is less than a Curie temperature for the storage layer.4. The apparatus of claim 1 , wherein the write layer comprises an FePt-based or CoPt-based material.5. The apparatus of claim 1 , wherein the write layer comprises FePtY or CoPtZ where Y and Z is chosen from the group of C claim 1 , an oxide claim 1 , a nitride claim 1 , a carbide claim 1 , and combinations thereof.6. The apparatus of claim 1 , wherein the storage layer has a room temperature anisotropy of greater then 40 kOe.7. The apparatus of claim 1 , wherein the storage layer has a Curie temperature of 550K or more and 750K or less.8. The apparatus of claim 1 , wherein the write layer has a Curie temperature of 650K or more and ...

Method and Manufacture Process for Exchange Decoupled First Magnetic Layer

A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO) and other non-magnetic elements (for example, Cr). A method of manufacturing the media is also disclosed. 120-. (canceled)21. An apparatus , comprising:a substrate of a magnetic recording medium; and{'sub': c', 'n, 'a granular magnetic layer of the medium, wherein the granular magnetic layer comprises one or more first layers being substantially completely exchange decoupled and one or more second layers being partially exchange coupled, wherein the one or more first layers have an Hof greater than about 4,000 Oe and an Hof less than about 0.25 H.'}22. The apparatus of claim 21 , wherein the one or more first layers have an Hof greater than about 6 claim 21 ,000 Oe and an Hof less than about 1 claim 21 ,000 Oe.23. The apparatus of claim 21 , wherein the one or more first layers comprise an oxide material in an amount of about 4 to about 12 mol %.24. The apparatus of claim 23 , wherein the oxide material is TiO.25. The apparatus of claim 21 , wherein the one or more first layers comprise a non-magnetic element.26. The apparatus of claim 25 , wherein the non-magnetic element is present in an amount of about 4 to about 20 mol %.27. The apparatus of claim 25 , wherein the non-magnetic element is Cr.28. The apparatus of claim 21 , wherein a composition of at least one of the first layers is CoCrPt—(TiO) claim 21 , wherein x has a value of from 4 to 20 claim 21 , y has a value of from 12 to 25 claim 21 , and z has a value of from 4 to 12.29. The apparatus of claim 28 , wherein the composition is CoCrPt—(TiO).30. The apparatus of claim 21 , wherein the one or more second layers are substantially free of oxide material.31. An apparatus claim 21 , ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCING DEVICE

According to one embodiment, a perpendicular magnetic recording medium includes an underlayer in which the width of the grain boundary between crystal grains is less than 0.5 nm, and a multilayered magnetic recording layer formed in contact with the underlayer by alternately stacking at least two magnetic layers and two nonmagnetic layers, which are sequentially provided on a substrate. Each of the magnetic layers is a magnetically continuous layer. The magnetic layer includes magnetic crystal grains mainly containing Co, and a plurality of pinning sites made of an oxide dispersed in the entire magnetic layer. The perpendicular magnetic recording medium has a magnetic characteristic having a magnetization curve with a slope α of 5 or more near the coercive force. 1. A perpendicular magnetic recording medium comprising:a substrate; andan underlayer provided on the substrate, made of crystal grains in which a width of a grain boundary between the crystal grains is less than 0.5 nm; anda multilayered magnetic recording layer formed in contact with the underlayer, and including at least two magnetic layers and two nonmagnetic layers which are alternately stacked,wherein the magnetic layer comprises a magnetically continuous film which is made of magnetic crystal grains mainly containing Co and an oxide dispersed in the entire magnetic layer, includes a plurality of pinning sites capable of pinning a domain wall, and is exchange-coupled in an in-plane direction in the entire magnetic recording layer, andthe perpendicular magnetic recording medium has a magnetic characteristic having a magnetization curve with a slope α of not less than 5 near a coercive force.2. The medium according to claim 1 , wherein the nonmagnetic layer mainly contains one of platinum and palladium.3. The medium according to claim 1 , wherein the oxide is at least one material selected from the group consisting of cobalt oxide claim 1 , titanium oxide claim 1 , silicon oxide claim 1 , tungsten oxide ...

VERTICALLY AND HORIZONTALLY WEAKLY COUPLED PERPENDICULAR SMALL GRAIN MEDIA

In one general embodiment, a magnetic medium includes a recording layer having at least three exchange control layers each having a magnetic moment less than 100 emu/cc, and four magnetic layers separated from one another by the exchange control layers. An uppermost of the magnetic layers is doped with oxygen. In another general embodiment, a magnetic medium includes a recording layer having at least three exchange control layers and four magnetic layers separated from one another by the exchange control layers. An uppermost of the magnetic layers has an oxygen content of greater than 0.5 vol %. An average pitch of magnetic grains in a lowermost of the magnetic layers is 9 nm or less. A lowermost of the magnetic layers has an oxide content of at least 20 vol %. 1. A magnetic medium , comprising:a recording layer having at least three exchange control layers each having a magnetic moment less than 100 emu/cc, and four magnetic layers separated from one another by the exchange control layers,wherein an uppermost of the magnetic layers is doped with oxygen.2. The magnetic medium as recited in claim 1 , wherein an average pitch of magnetic grains in a lowermost of the magnetic layers is 9 nm or less.3. The magnetic medium as recited in claim 1 , wherein a lowermost of the magnetic layers has an oxide content of at least 20 vol %.4. The magnetic medium as recited in claim 1 , wherein a lowermost of the magnetic layers has a highest Ku value relative to the other magnetic layers claim 1 , wherein a Ku value of each of the other magnetic layers is less than the Ku value of the magnetic layer immediately therebelow.5. The magnetic medium as recited in claim 1 , wherein an uppermost of the magnetic layers is a cap layer.6. The magnetic medium as recited in claim 5 , wherein an oxygen content of the cap layer is in a range of about 0.5 to about 30 vol %.7. The magnetic medium as recited in claim 5 , wherein grain boundaries in the magnetic layer are generally aligned ...

MAGNETIC RECORDING MEDIUM

A magnetic recording medium includes a substrate and a stacked film on the substrate and including a magnetic recording layer. An elastic modulus Eof the substrate satisfies Equation (1) below, where h is a film thickness of the stacked film and Eis an Young's modulus of the stacked film: 1. A magnetic recording medium comprising:a substrate; anda stacked film on the substrate and including a magnetic recording layer,{'sub': sub', 'film, 'claim-text': {'br': None, 'i': E', 'E', 'h, 'sub': sub', 'film, '≤(200*)/(6*)\u2003\u2003(1).'}, "wherein an elastic modulus Eof the substrate satisfies Equation (1) below, where h is a film thickness of the stacked film and Eis an Young's modulus of the stacked film,"}2. The magnetic recording medium according to claim 1 ,wherein the substrate has a flexural elastic modulus equal to or greater than 75 GPa.3. The magnetic recording medium according to claim 2 ,wherein the substrate includes a base material and an alloy layer formed on the base material.4. The magnetic recording medium according to claim 3 ,wherein the alloy layer has a multilayer structure that includes a first plated layer formed on the substrate and a second plated layer formed on the first plated layer.5. The magnetic recording medium according to claim 4 ,wherein the first plated layer has a flexural elastic modulus equal to or greater than 78 GPa.6. The magnetic recording medium according to claim 1 , wherein the substrate includes an aluminum base layer and an NiP layer on the aluminum base layer claim 1 , and the stacked film includes intermediate layers between the magnetic recording layer and the substrate.7. The magnetic recording medium according to claim 6 , wherein the intermediate layers include a FeCoTa layer on the substrate claim 6 , a NiW layer on the FeCoTa layer claim 6 , and a Ru layer on the NiW layer.8. The magnetic recording medium according to claim 7 , wherein the magnetic recording layer is directly in contact with the Ru layer and ...

Perpendicular magnetic recording medium

A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material.

DUAL SEGREGANT HEAT ASSISTED MAGNETIC RECORDING (HAMR) MEDIA

In one embodiment, a magnetic media suitable for HAMR recording includes a recording layer having first and second magnetic layers. The first magnetic layer has a first segregant between magnetic grains thereof, the first segregant being primarily C. Moreover, the second magnetic layer is formed above the first magnetic layer. The second magnetic layer has a second segregant between magnetic grains thereof, the second segregant being primarily C and a second component. Additional systems and methods are also described herein. 1. A magnetic medium , comprising:a recording layer having first and second magnetic layers,the first magnetic layer having a first segregant between magnetic grains thereof, the first segregant being primarily C,the second magnetic layer being formed above the first magnetic layer, the second magnetic layer having a second segregant between magnetic grains thereof, the second segregant being primarily C and a second component.2. The magnetic medium as recited in claim 1 , wherein the second component is selected from a group consisting of: SiO claim 1 , TiO claim 1 , TaO claim 1 , SiC claim 1 , SiN claim 1 , TiC claim 1 , TiN claim 1 , BN claim 1 , BC claim 1 , CrO claim 1 , CrN.3. The magnetic medium as recited in claim 2 , wherein the second component is BN.4. The magnetic medium as recited in claim 2 , wherein the recording layer has a third magnetic layer having a third segregant between magnetic grains thereof claim 2 , the third segregant comprising the second component claim 2 , the third segregant having a different composition than the second segregant.5. The magnetic medium as recited in claim 1 , wherein a C content in the second segregant is in a range of about 50 to about 80 vol % claim 1 , wherein a content of the second component in the second segregant is in a range of about 20 to about 50 vol %.6. The magnetic medium as recited in claim 5 , wherein the second component is selected from a group consisting of: SiO claim 5 , TiO ...

LAMINATING MAGNETIC CORES FOR ON-CHIP MAGNETIC DEVICES

A laminating structure includes a first magnetic layer, a second magnetic layer, a first spacer disposed between the first and second magnetic layers and a second spacer disposed on the second magnetic layer. 1. A laminating structure , comprising:a first magnetic layer;a second magnetic layer;a first spacer disposed between the first and second magnetic layers; anda second spacer disposed on the second magnetic layer.2. The structure as claimed in further comprising a seed layer disposed on the first magnetic layer.3. The structure as claimed in further comprising a substrate disposed on the seed layer.4. The structure as claimed in wherein the first spacer is thin relative to the second spacer.5. The structure as claimed in wherein the first spacer removes closure domains in the structure via magneto-static coupling between the first and second magnetic layers.6. The structure as claimed in wherein the first spacer is non-magnetic.7. The structure as claimed in wherein the second spacer reduces eddy current in the structure.8. The structure as claimed in wherein the second spacer is highly resistive relative to the first and second magnetic layers and the first spacer.9. A multi-layer laminating structure comprising:a first magnetic unit layer;a second magnetic unit layer; anda spacer disposed between the first and second magnetic unit layers.10. The structure as claimed in wherein each of the first and second unit layers comprises:a first magnetic layer;a second magnetic layer; andan additional spacer disposed between the first and second magnetic layers.11. The structure as claimed in further comprising a seed layer disposed on the first magnetic layer.12. The structure as claimed in further comprising a substrate disposed on the seed layer.13. The structure as claimed in wherein the additional spacer is thin relative to the spacer.14. The structure as claimed in wherein the additional spacer removes closure domains in the structure via magneto-static coupling ...

MAGNETIC RECORDING MEDIUM

A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 μm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less. 1. A magnetic recording medium comprising:a base substance having flexibility;a crystal control layer provided on the base substance; anda magnetic layer provided on the crystal control layer, whereinthe magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 μm or less,the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, andthe number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.2. The magnetic recording medium according to claim 1 , whereinthe base substance has an uneven surface on the recording surface side, andthe uneven surface of the base substance has an uneven shape substantially similar to the recording surface.3. The magnetic recording medium according to claim 2 , wherein the recording surface substantially conforms to the uneven surface of the base substance.4. The magnetic recording medium according to claim 1 , comprising:an uneven layer provided between the base substance and the crystal control layer and having an uneven surface on the crystal control layer side, whereinthe uneven layer contains particulates.5. The magnetic recording medium according to claim 4 , wherein the uneven layer is a coating layer.6. The magnetic recording medium according to claim 4 , wherein the uneven surface of the uneven layer is ...

UNDERLAYER FOR PERPENDICULARLY MAGNETIZED FILM, PERPENDICULARLY MAGNETIZED FILM STRUCTURE, PERPENDICULAR MTJ ELEMENT, AND PERPENDICULAR MAGNETIC RECORDING MEDIUM USING THE SAME

Disclosed is a perpendicularly magnetized film structure that uses a highly heat resistant underlayer film on which a cubic or tetragonal perpendicularly magnetized film can grow with high quality, the structure comprising any one substrate () of a cubic single crystal substrate having a (001) plane, or a substrate having a cubic oriented film that grows to have the (001) plane; an underlayer () formed on the substrate () from a thin film of a metal having an hcp structure, such as Ru or Re, in which the [0001] direction of the thin metal film forms an angle in the range of 42° to 54° with respect to the <001> direction or the (001) orientation of the substrate (); and a perpendicularly magnetized layer () located on the metal underlayer () and formed from a cubic material selected from the group consisting of a Co-based Heusler alloy, a cobalt-iron (CoFe) alloy having a bcc structure, and the like, as a constituent material, and grown to have the (001) plane. 1. An underlayer for a perpendicularly magnetized film comprising a metal having an hcp structure , wherein a [0001] direction of the underlayer forms an angle in the range of 42° to 54° with respect to a cubic single crystal substrate having a (001) plane or a cubic oriented film grown to have a (001) plane.2. The underlayer for a perpendicularly magnetized film according to claim 1 , wherein at least one of the cubic single crystal substrate or the cubic oriented film is formed from magnesium oxide or magnesium-titanium oxide.3. The underlayer for a perpendicularly magnetized film according to claim 1 , wherein the metal has a structure having any one of a (02-23) plane claim 1 , a (03-35) plane and a (03-34) plane.4. The underlayer for a perpendicularly magnetized film according to claim 1 , wherein the metal is at least one kind of noble metals.5. The underlayer for a perpendicularly magnetized film according to claim 4 , wherein the noble metal is ruthenium (Ru) or rhenium (Re).6. A perpendicularly ...

PERPENDICULAR MAGNETIC RECORDING MEDIA WITH LATERAL EXCHANGE CONTROL LAYER

A magnetic media having a lateral exchange control layer formed on a magnetic oxide layer of a magnetic recording layer. A cap layer is formed over the lateral exchange control layer. The lateral exchange control layer can be an alloy comprising Co and one or more of W, Ru, Hf, Ta, Nb and Fe. The lateral exchange control layer has the highest magnetic saturation moment among all the recording layers, and increases spacing between magnetic grains (e.g. increased non-magnetic boundary width), thereby reducing lateral exchange sigma. The presence of lateral exchange control increases signal to noise ratio and reduces bit error rate and increases areal density. 1. A magnetic media , comprising:a magnetically soft under-layer; anda magnetic recording layer formed over the magnetically soft under-layer, the magnetic recording layer further comprising:a granular magnetic layer;a magnetic lateral exchange control layer positioned on the granular magnetic layer; anda magnetic cap layer formed over the lateral exchange control layer, wherein the magnetic cap layer comprises magnetic grains separated by non-magnetic grain boundaries;wherein the lateral exchange control layer comprises an alloy that includes Co and at least one of W, Ru, Hf, Ta, Nb and Fe.2. The magnetic media as in claim 1 , wherein the concentration of non-magnetic material in the lateral exchange control layer is less than 25 atomic percent.3. The magnetic media as in claim 1 , wherein the concentration of non-magnetic material in the lateral exchange control layer is greater than 10 atomic percent and less than 25 atomic percent.4. The magnetic media as in claim 1 , wherein the concentration of one or more of W claim 1 , Ru claim 1 , Hf claim 1 , Ta claim 1 , Nb and Fe is at least 10 atomic percent.5. The magnetic media as in wherein the lateral exchange control layer has a higher magnetic saturation than the granular magnetic layer or the cap layer.6. The magnetic media as in wherein the lateral exchange ...

PERPENDICULAR MAGNETIC RECORDING DISK WITH TEMPLATE LAYER FORMED OF NANOPARTICLES EMBEDDED IN A POLYMER MATERIAL

A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution. 1. A perpendicular magnetic recording disk comprising:a substrate;a template layer on the substrate, the template layer comprising nanoparticles spaced-apart by and embedded within a polymer material, the nanoparticles providing protrusion features at the surface of the polymer material;a seed layer covering the polymer material and the nanoparticles;an underlayer selected from Ru and a Ru alloy on the seed layer; anda perpendicular magnetic recording layer on the underlayer and comprising a layer of granular ferromagnetic Co alloy and one or more oxides of one or more of Si, Ta, Ti Nb, B, C, and W.2. The disk of wherein the nanoparticles are FeOnanoparticles and the polymer material comprises polystyrene having a functional end group.3. The disk of wherein the seed layer is selected from an amorphous NiTa alloy and an amorphous CoFeTaZr alloy.4. The disk of wherein the seed layer has a thickness greater than or equal to 1 nm and less than or equal to 5 nm.5. The disk of wherein the seed layer is a first seed layer and further comprising a second seed layer on and in contact with the first seed layer claim 1 , and wherein the underlayer is on and in ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

According to one embodiment, provided is a perpendicular magnetic recording medium including an orientation control layer formed on a non-magnetic substrate, the orientation control layer consisting of a Ni alloy having fcc structure, non-magnetic buffer layer containing silver having fcc structure, non-magnetic seed layer consisting of Ag particles having fcc structure and amorphous Ge grain boundaries between the Ag particles, non-magnetic intermediate layer consisting of Ru or Ru alloy, and perpendicular magnetic recording layer, wherein the orientation control layer contacts the non-magnetic buffer layer, and the non-magnetic buffer layer contacts the non-magnetic seed layer. 1. A perpendicular magnetic recording medium comprising:a non-magnetic substrate;an orientation control layer formed on the non-magnetic substrate, the orientation control layer consisting of a nickel alloy having fcc structure;a non-magnetic buffer layer formed in contact with the orientation control layer of nickel alloy, the non-magnetic buffer layer containing silver having fcc structure;a non-magnetic seed layer formed in contact with the non-magnetic buffer layer, the non-magnetic seed layer consisting of silver particles having fcc structure and amorphous germanium grain boundaries between the silver particles;a non-magnetic intermediate layer formed on the non-magnetic seed layer, the non-magnetic intermediate layer consisting of ruthenium or ruthenium alloy; anda perpendicular magnetic recording layer formed on the non-magnetic intermediate layer.2. The perpendicular magnetic recording medium of claim 1 , wherein the non-magnetic buffer layer contains silver and one or two additive metals selected from the group consisting of nickel claim 1 , germanium claim 1 , hafnium claim 1 , and titan.3. The perpendicular magnetic recording medium of claim 2 , wherein the non-magnetic buffer layer includes crystal grains having fcc structure whose main ingredient is silver and a grain boundary ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME

According to one embodiment, a perpendicular magnetic recording medium includes a substrate, an underlayer formed on the substrate and a magnetic recording layer formed on the underlayer and having an easy axis in a direction perpendicular to a film surface. The underlayer includes a plurality of projecting portions arranged at a distance of 1 nm to 20 nm from one another. The magnetic recording layer is an amorphous magnetic recording layer including a plurality of magnetic grains each formed to expand towards a top end thereof from a surface of a respective projecting portion of the underlayer, at least those of the magnetic grains located on a respective projecting portion side being separated from each other. 1. A perpendicular magnetic recording medium comprising:a substrate;an underlayer formed on the substrate and comprising a plurality of projecting portions arranged at a distance of 1 nm to 20 nm from one another; andan amorphous magnetic recording layer comprising a plurality of magnetic grains each formed to expand towards a top end thereof from a surface of a respective projecting portion of the underlayer, having an easy axis in a direction perpendicular to a film surface, at least those of the magnetic grains located on a respective projecting portion side being separated from each other.2. The perpendicular magnetic recording medium of claim 1 , wherein the top ends of the plurality of magnetic grains are brought into contact with each other claim 1 , and those of the magnetic grains located on the respective projecting portion side are separated from each other in a film thickness direction by ⅓ or more.3. The perpendicular magnetic recording medium of claim 1 , wherein a dispersion of pitches of the projecting portions is 20% or less.4. The perpendicular magnetic recording medium of claim 1 , wherein the projecting portions have one of semicircular and trapezoidal shape in cross section.5. The perpendicular magnetic recording medium of claim 1 , ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM

A perpendicular magnetic recording medium is disclosed in which crystal axis orientation dispersion, crystal grain diameter, and crystal grain diameter dispersion in a magnetic recording layer are reduced. The perpendicular magnetic recording medium has a structure having, stacked sequentially on a non-magnetic substrate, at least an amorphous underlayer, a lower orientation control layer made of Ru or Ru alloy of an hcp structure, an upper orientation control layer that is made of alloy containing an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo and that has an fcc or hcp structure, an intermediate layer, and a magnetic recording layer. 1. A perpendicular magnetic recording medium comprising:a non-magnetic substrate,an underlayer with an amorphous single-layer structure or a stacking structure configured by a plurality of layers in which at least a layer, out of the plurality of layers, that is in contact with the lower orientation control layer on the non-magnetic substrate side is amorphous,a lower orientation control layer made of Ru or Ru alloy, and having an hcp structure,an upper orientation control layer made of an alloy that contains an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo, and having an fcc or hcp structure,an intermediate layer, anda magnetic recording layer,wherein the layers are stacked sequentially on a non-magnetic substrate.2. The perpendicular magnetic recording medium according to claim 1 , wherein the lower orientation control layer has a film thickness of 0.3 nm to 2.5 nm claim 1 , and the upper orientation control layer has a film thickness of 2.0 nm to 12.0 nm.3. The perpendicular magnetic recording medium according to claim 1 , wherein the underlayer and the upper orientation control layer are soft magnetic layers and are magnetically coupled to each other by the lower orientation ...

MAGNETIC STORAGE MEDIUM AND MAGNETIC RECORDING APPARATUS

According to one embodiment, a magnetic storage medium includes a plurality of recording layers and a first non-magnetic layer. The plurality of recording layers each includes at least one first magnetic layer and at least one second magnetic layer. The first magnetic layer is made of a first magnetic material which has a first effective perpendicular magnetic anisotropy. Data is stored in first magnetic layer in accordance with a direction of magnetization. The second magnetic layer is made of a second magnetic material having a second effective perpendicular magnetic anisotropy smaller than the first effective perpendicular magnetic anisotropy. First magnetization of the first magnetic layer and second magnetization of the second magnetic layer are in magnetic coupling. 1. A magnetic storage medium , comprising:a plurality of recording layers each including at least one first magnetic layer and at least one second magnetic layer, the first magnetic layer being made of a first magnetic material which has a first effective perpendicular magnetic anisotropy, data being stored in the first magnetic layer in accordance with a direction of magnetization, the second magnetic layer being made of a second magnetic material having a second effective perpendicular magnetic anisotropy smaller than the first effective perpendicular magnetic anisotropy, first magnetization and second magnetization being in magnetic coupling, the first magnetization being magnetization of the first magnetic layer, the second magnetization being magnetization of the second magnetic layer; anda first non-magnetic layer made of a non-magnetic material and provided between the recording layers.2. The medium according to claim 1 , wherein the first magnetization and the second magnetization are in ferromagnetic coupling.3. The medium according to claim 1 , wherein the first magnetization and the second magnetization are in antiferromagnetic coupling claim 1 , the antiferromagnetic coupling indicating ...

Exchange Decoupled Data Storage Medium

A magnetic data storage medium capable of storing data bits may be configured at least with a magnetic underlayer structure and a recording structure. The recording structure can have at least a first magnetic layer and a second magnetic layer with the first magnetic layer decoupled by being constructed of an alloy of cobalt, platinum, and a platinum group metal element.

MAGNETIC TAPE DEVICE AND HEAD TRACKING SERVO METHOD

The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30. 1. A magnetic tape device comprising:a magnetic tape; anda servo head,wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element,the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,the magnetic layer includes a servo pattern, anda coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.2. The magnetic tape device according to claim 1 ,wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.20 to 0.30.3. The magnetic tape device according to claim 1 ,wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.4. The magnetic tape device according to claim 3 ,wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.5. The magnetic tape device according to claim 1 ,wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, anda total ...

MAGNETIC RECORDING MEDIUM

There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSD/PSD, and a ratio PSD/PSDon the surface satisfy Ra≦3.0 nm, PSD/PSD≦0.65, and 1.3≦PSD/PSD≦2.3, in which PSDis an average value of PSD values in a range from 0.15 μm to 0.4 μm in the longitudinal direction of the surface, PSDis an average value of PSD values in a range from 0.15 μm to 0.4 μm in the lateral direction of the surface, PSDis an average value of PSD values in a range from 0.4 μm to 5.0 μm in the longitudinal direction of the surface, and PSDis an average value of PSD values in a range from 0.4 μm to 5.0 μm in the lateral direction of the surface. 1. A magnetic recording medium comprising:a surface having a longitudinal direction and a lateral direction,{'sub': MD,short', 'TD,short', 'MD,long', 'TD,long, 'claim-text': [{'br': None, 'Ra≦3.0 nm,'}, {'br': None, 'sub': MD,short', 'TD,short, 'PSD/PSD≦0.65, and'}, {'br': None, 'sub': MD,long', 'TD,long, '1.3≦PSD/PSD≦2.3,'}], 'wherein an arithmetic average roughness Ra, a ratio PSD/PSD, and a ratio PSD/PSDon the surface satisfy the following relational expressions'}{'sub': MD,short', 'TD,short', 'MD,long', 'TD,long, 'wherein PSDis an average value of PSD values in a range of 0.15 μm or more and 0.4 μm or less in the longitudinal direction of the surface, PSDis an average value of PSD values in a range of 0.15 μm or more and 0.4 μm or less in the lateral direction of the surface, PSDis an average value of PSD values in a range of 0.4 μm or more and 5.0 μm or less in the longitudinal direction of the surface, and PSDis an average value of PSD values in a range of 0.4 μm or more and 5.0 μm or less in the lateral direction of the surface.'}2. The magnetic recording medium according to claim 1 , comprising:a base substance containing a polymer resin; anda laminated film having the surface which is laminated on the base substance.3. The magnetic ...

MAGNETIC STACK INCLUDING CRYSTALLIZED SEGREGANT INDUCED COLUMNAR MAGNETIC RECORDING LAYER

A stack includes a substrate, a magnetic recording layer having a columnar structure, and an interlayer disposed between the substrate and the magnetic recording layer. The columnar structure includes magnetic grains separated by a crystalline segregant or a combination of crystalline and amorphous segregants. 1. A stack , comprising;a substrate;a magnetic recording layer having a columnar structure comprising magnetic grains separated by a crystalline segregant; andan interlayer disposed between the substrate and the magnetic recording layer.2. The stack of claim 1 , wherein the magnetic grains comprise FePt.3. The stack of claim 1 , wherein the crystalline segregant is at least one of MgO claim 1 , TiO claim 1 , ZrO claim 1 , and TiC.4. The stack of claim 1 , wherein the crystalline segregant is ZrO.5. The stack of claim 4 , wherein the magnetic recording layer comprises ZrOin an amount between about 5 and about 50 vol. %.6. The stack of claim 1 , wherein the crystalline segregant comprises at least 50% crystalline structure.7. The stack of claim 1 , wherein the magnetic recording layer further comprises an amorphous segregant disposed between the magnetic grains and the crystalline segregant.8. The stack of claim 7 , wherein the amorphous segregant is at least one of an oxide and a nitride.9. The stack of claim 7 , wherein the amorphous segregant is at least one of C claim 7 , SiO claim 7 , TiO claim 7 , WO claim 7 , TaO claim 7 , and BN.10. The stack of claim 1 , wherein the interlayer is a TiN—X layer claim 1 , wherein X is a dopant comprising at least one of MgO claim 1 , TiC claim 1 , TiO claim 1 , TiO claim 1 , ZrN claim 1 , ZrC claim 1 , ZrO claim 1 , ZrO claim 1 , HfN claim 1 , HfC claim 1 , HfO claim 1 , and HfO.11. The stack of claim 1 , wherein the interlayer is a MgO—Y layer claim 1 , wherein Y is a dopant comprising at least one of Ni claim 1 , Ti claim 1 , and Zr.12. The stack of claim 1 , wherein a thickness of the magnetic recording layer is ...

CoPtCr-BASED BIT PATTERNED MAGNETIC DEVICE

Provided herein is an apparatus, including a plurality of spaced apart perpendicular magnetic elements. Each of the magnetic elements includes a respective discrete magnetic domain and each of the magnetic elements includes a magnetic recording layer comprising a CoPtCralloy material, where 0.05≦x≦0.35 and 0≦y≦0.15. 1. An apparatus , comprising:{'sub': 1-x-y', 'x', 'y, 'a plurality of spaced apart perpendicular magnetic elements above a surface of a substrate, wherein each of the magnetic elements comprises a respective discrete magnetic domain, and wherein each of the magnetic elements comprises a seed layer and a magnetic recording layer, wherein the magnetic recording layer comprises a CoPtCralloy material, where 0.05≦x≦0.35 and 0≦y≦0.15.'}2. The apparatus according to claim 1 , wherein the CoPtCralloy material has a first order magnetic anisotropy constant Kup to approximately 2×10erg/cm claim 1 , a saturation magnetization M claim 1 , up to approximately 1200 emu/cm claim 1 , and an anisotropy field H=2K/Mup to approximately 35 kOe.3. The apparatus according to claim 2 , wherein the perpendicular magnetic recording layer has a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof and an X-Ray diffraction (XRD) rocking curve with a full width at half maximum (FWHM) of ˜5° or less.4. The apparatus according to claim 1 , wherein the seed layer is lattice matched to and configured to promote growth of the perpendicular magnetic recording layer with a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof and an XRD rocking curve with full width at half maximum (FWHM) of ˜5° or less.5. The apparatus according to claim 4 , wherein the seed layer is from approximately 5 to approximately 10 nm thick.6. The apparatus according to claim 5 , wherein the seed layer is formed of elemental ruthenium (Ru).7. The apparatus according to claim 1 , wherein 0.23≦x≦0.33 claim 1 , y=0 claim 1 , and the CoPtCralloy material is a ...

MAGNETIC RECORDING MEDIUM WITH MULTIPLE EXCHANGE COUPLING LAYERS AND SMALL GRAIN MAGNETIC LAYERS

According to one embodiment, a magnetic recording medium includes: a substrate; and a magnetic recording layer structure formed above the substrate. The magnetic recording layer structure includes five or more magnetic recording layers and four or more nonmagnetic exchange coupling layers, where the magnetic recording layers and the nonmagnetic exchange coupling layers are arranged in an alternating pattern, and where the magnetic recording layers are separated from each other by least one of the nonmagnetic exchange coupling layers. The magnetic recording layer positioned closest to the substrate has each of the following: an average magnetic grain pitch of about 8.3 nm or less, a magnetic anisotropy field (H) value of greater than or equal to about 20 kOe, and a thickness that is about 40% of a total thickness of the magnetic recording layer structure. 1. A magnetic recording medium comprising: a plurality of magnetic recording layers; and', 'a plurality of nonmagnetic exchange coupling layers alternating with the plurality of magnetic recording layers;, 'a recording layer structure comprisingwherein each of the plurality of nonmagnetic exchange coupling layers comprises a CoCrPtX-oxide material, wherein X comprises at least one of Ta, Si, Ru, Ti, B, Cu, Ni, V, Mo, Mn.2. The magnetic recording medium of claim 1 , wherein the plurality of magnetic recording layers comprises at least four magnetic recording layers and the plurality of nonmagnetic exchange coupling layers comprises at least three nonmagnetic exchange coupling layers.3. The magnetic recording medium of claim 1 , wherein a total thickness of the recording layer structure is twelve nanometers to twenty nanometers.4. The magnetic recording medium of claim 1 , wherein at least one of the plurality of magnetic recording layers comprises one or more of Co claim 1 , Cr claim 1 , Fe claim 1 , Ta claim 1 , Ni claim 1 , Mo claim 1 , Pt claim 1 , W claim 1 , Cr claim 1 , Ru claim 1 , Ti claim 1 , Si claim 1 , O ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM

A perpendicular magnetic recording medium includes a non-magnetic substrate; and a magnetic recording layer that includes magnetic crystal grains and a non-magnetic crystal grain boundary that surrounds the magnetic crystal grains, wherein the magnetic crystal grains contain an ordered alloy and the non-magnetic crystal grain boundary contains Ge oxides. The magnetic recording layer may have a granular structure. The magnetic crystal grains may be micronized to be sufficiently ordered and separated, and the perpendicular magnetic recording medium may have a high magnetic anisotropy constant Ku and high coercivity Hc. 1. A perpendicular magnetic recording medium , comprising:a non-magnetic substrate; anda magnetic recording layer that includes magnetic crystal grains and a non-magnetic crystal grain boundary that surrounds the magnetic crystal grains,wherein the magnetic crystal grains contain an ordered alloy and the non-magnetic crystal grain boundary contains Ge oxides.2. The perpendicular magnetic recording medium according to claim 1 , wherein the magnetic recording layer has a granular structure.3. A perpendicular magnetic recording medium claim 1 , comprising:a non-magnetic substrate; anda magnetic recording layer which has a granular structure that includes magnetic crystal grains and a non-magnetic crystal grain boundary that surrounds the magnetic crystal grains,wherein the magnetic crystal grains contain an ordered alloy and the non-magnetic crystal grain boundary contains Ge oxides.4. The perpendicular magnetic recording medium according to claim 3 , wherein the non-magnetic crystal grain boundary further contains at least one oxide selected from the group consisting of Mn oxides claim 3 , Si oxides claim 3 , Al oxides claim 3 , Zn oxides claim 3 , B oxides claim 3 , and Ti oxides.5. The perpendicular magnetic recording medium according to claim 4 , wherein the ordered alloy of the magnetic crystal grains includes a L1-based ordered alloy.6. The ...

MAGNETIC RECORDING MEDIUM

A magnetic recording medium with a reduced average grain diameter and reduced grain diameter dispersion is provided. A magnetic recording medium having a magnetic property (magnetic anisotropy energy) applicable as a magnetic recording medium is provided. It is a magnetic recording medium containing a substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer containing an ordered alloy in this order, in which the second seed layer is composed of crystal grains having TiN as a main component, and a grain boundary material having at least one or more selected from the group consisting of metal oxides and carbon as a main component. 1. A magnetic recording medium , comprisinga substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer, disposed above one another in this order, wherein the recording layer contains an ordered alloy and the second seed layer is composed of(i) crystal grains having TiN as a main component, and(ii) a grain boundary material having at least one or more materials selected from the group consisting of a metal oxide and carbon, as a main component.2. The magnetic recording medium according to claim 1 , wherein claim 1 , the grain boundary material is a metal oxide claim 1 , and for ΔGdefined as a standard Gibbs energy of formation at 500° C. claim 1 , ΔGof a nitride that is formed through a reaction between nitrogen and a metal element in the metal oxide constituting the grain boundary material is higher than ΔGof TiN.3. The magnetic recording medium according to claim 1 , wherein claim 1 , the grain boundary material is a metal oxide claim 1 , and for ΔGdefined as a standard Gibbs energy of formation at 500° C. claim 1 , ΔGof the metal oxide constituting the grain boundary material is lower than ΔGof TiO.4. The magnetic recording medium according to claim 1 , wherein the grain boundary material is at least one oxide selected from ...

TAPE RECORDING MEDIUM

In a tape recording medium, a sliding layer has an electric resistance of 1×10Ω/sq or less, and contains carbon particles and solid particles. The carbon particles have a primary particle size of 30 nm or less and a BET specific surface area of 100 m/g or more. The solid particles have a primary particle size of 100 nm or less, a Mohs' hardness in a range from 2.5 to 8, inclusive, a density of 3 g/cmor more, and a BET specific surface area of 30 m/g or more. 1. A tape recording medium comprising:a support;a recording layer disposed on a first principal surface of the support; anda sliding layer disposed on a second principal surface of the support,{'sup': '8', 'claim-text': [{'sup': '2', 'carbon particles having a primary particle size of 30 nm or less and a BET specific surface area of 100 m/g or more; and'}, {'sup': 3', '2, "solid particles having a primary particle size of 100 nm or less, a Mohs' hardness in a range from 2.5 to 8, inclusive, a density of 3 g/cmor more, and a BET specific surface area of 30 m/g or more."}], 'wherein the sliding layer has an electric resistance of 1×10Ω/sq or less, and includes2. The tape recording medium according to claim 1 ,wherein the sliding layer has a Young's modulus of 13 GPa or more in a thickness direction of the sliding layer.3. The tape recording medium according to claim 1 ,{'sup': '3', 'wherein the sliding layer has a true density of 1.640 g/cmor more.'}4. The tape recording medium according to claim 1 ,{'sup': '7', 'wherein the sliding layer has an electric resistance of 5×10Ω/sq or less.'}5. The tape recording medium according to claim 1 , particles of a metal oxide;', 'particles of an elemental metal or an alloy;', 'ceramic particles;', 'inorganic or organic particles each coated with an elemental metal or an alloy,', 'particles of a carbide,', 'inorganic particles coated with carbon,', 'particles of an elemental metal or an alloy each coated with carbon, and', 'carbon particles supporting an elemental metal, an ...

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

A magnetic recording medium includes a non-magnetic substrate on which at least a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer are disposed. The perpendicular magnetic layer includes first to fourth magnetic layers. A first exchange coupling control layer is disposed between the first magnetic layer and the second magnetic layer. A second exchange coupling control layer is disposed between the second magnetic layer and the third magnetic layer. Following relations are satisfied where Kuis a magnetic anisotropic constant of an i-th magnetic layer, Msis a saturation magnetization of the i-th magnetic layer, and tis a film thickness of the i-th magnetic layer, Ku>Ku, Ku>Ku, Ms×t>Ms×t, Ms×t>Ms×tKu Подробнее

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having a L1type crystal structure whose plane orientation is (001). The substrate, the underlayer, and the magnetic layer are stacked in this order. The underlayer includes a first underlayer. The first underlayer is a crystalline layer that includes a material containing Al, Ag, Cu, W, or Mo as a main component element and includes an oxide of the main component element, a content of the oxide of the main component element in the first underlayer being in a range of from 2 mol % to 30 mol %. 1. A magnetic recording medium comprising:a substrate;an underlayer; and{'sub': '0', 'a magnetic layer including an alloy having a L1type crystal structure whose plane orientation is (001),'}wherein the substrate, the underlayer, and the magnetic layer are stacked in this order,wherein the underlayer includes a first underlayer, andwherein the first underlayer is a crystalline layer that includes a material containing Al, Ag, Cu, W, or Mo as a main component element and includes an oxide of the main component element, a content of the oxide of the main component element in the first underlayer being in a range of from 2 mol % to 30 mol %.2. The magnetic recording medium according to claim 1 ,wherein the underlayer further includes a second underlayer provided between the substrate and the first underlayer, andwherein the second underlayer is a crystalline layer that contains, as a main component, an element having a crystal structure and a plane orientation equal to a crystal structure and a plane orientation of the main component element and that does not contain an oxide.3. The magnetic recording medium according to claim 2 , wherein the second underlayer contains Ag claim 2 , Cu claim 2 , W claim 2 , or Mo as the main component.4. The magnetic recording medium according to claim 1 , wherein the first underlayer has a non-granular structure.5. The magnetic recording ...

TAPE RECORDING MEDIUM, INFORMATION RECORDING/REPRODUCING DEVICE, AND METHOD OF MANUFACTURING TAPE RECORDING MEDIUM

Provided is a tape recording medium including: a base layer having a first surface and a second surface; a first recording layer disposed over the first surface of the base layer and capable of optically recording first data; an imprinted layer disposed between the base layer and the first recording layer; and a second recording layer. The second recording layer is disposed over the second surface of the base layer, contains a magnetic material, and has recorded second data different from the first data. 1. A tape recording medium comprising:a base layer having a first surface and a second surface;a first recording layer disposed over the first surface of the base layer and capable of optically recording first data;an imprinted layer disposed between the base layer and the first recording layer; anda second recording layer disposed over the second surface of the base layer, containing a magnetic material, and having recorded second data different from the first data.2. The tape recording medium according to claim 1 , whereinthe second data is information relating to a position along a longitudinal direction of the tape recording medium.3. The tape recording medium according to claim 2 , whereinthe second data is information indicating a position along a track provided over the first recording layer.4. The tape recording medium according to claim 1 , whereinthe imprinted layer is provided repeatedly with a predetermined tracking pattern.5. An information recording/reproducing device for recording or reproducing first data in or from a tape recording medium claim 1 , the device comprising:an optical recording/reproducing unit configured to optically record or reproduce the first data; anda magnetic recording/reproducing unit configured to magnetically record or reproduce second data in or from the tape recording medium, the second data being different from the first data.6. A method of manufacturing a tape recording medium claim 1 , the method comprising the steps of: ...

Perpendicular magnetic recording medium

The purpose of the present invention is to provide a magnetic recording medium including a first magnetic recording layer having a large coercive force and a granular structure in which magnetic crystal grains are well separated from each other. The magnetic recording medium of the present invention includes a non-magnetic substrate, a first seed layer, and a first magnetic recording layer formed on the first seed layer, wherein the first seed layer includes Pt, the first magnetic recording layer includes one or more magnetic layers, the magnetic layer in contact with the first seed layer includes Fe, Pt and Ti, and the magnetic layer in contact with the first seed layer has a granular structure consisting of magnetic crystal grains of a L1 0 type ordered alloy including Fe and Pt, and a non-magnetic grain boundary including Ti.

Perpendicular magnetic recording medium

Embodiments of a perpendicular magnetic recording medium include: a base; at least a first magnetic recording layer having a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape; a non-magnetic split layer containing Ru disposed on the first magnetic layer; and a second magnetic recording layer that is disposed on the split layer and that has a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape, wherein the first magnetic layer and the second magnetic layer contain oxides that form the grain boundary, and when an oxide content of the first magnetic layer is represented by A and an oxide content of the second magnetic layer is represented by B, a relationship between the oxide contents A/B is in the range of 0.5<A/B<1.0.

LAMINATING MAGNETIC CORES FOR ON-CHIP MAGNETIC DEVICES

A laminating structure includes a first magnetic layer, a second magnetic layer, a first spacer disposed between the first and second magnetic layers and a second spacer disposed on the second magnetic layer. 1a first magnetic unit consisting of first and second magnetic layers and a non-magnetic spacer layer therebetween, wherein the non-magnetic spacer layer has a thickness of 5 to 20 nanometers and is selected from the group consisting of copper, molydenum, zinc, rubidium, gold, silver, selenium, tellurium, sulfur, phosphorous, gallium, chromium, rhenium, indium, tin, nickel phosphorous, nickel boron, and non-magnetic alloys thereof;at least one additional magnetic unit consisting of first and second magnetic layers and the non-magnetic spacer layer therebetween;a resistive spacer disposed between the first and the at least one additional magnetic units, wherein the resistive spacer is at a thickness of 100 nm to 1 micron and is selected from the group consisting of selenium, bismuth, tellurium, phosphorous, sulfur, germanium, antimony, and alloys thereof that can be electrochemically reduced, andwherein a total thickness of the first and second magnetic layers plus the non-magnetic spacer layer within the magnetic unit or the at least one additional magnetic unit consisting of first and second magnetic layers and the non-magnetic spacer layer therebetween is within a skin depth, wherein the skin depth is a depth below a surface of a respective magnetic layer at which current density has fallen to 1/e of surface current density.. An on-chip magnetic device consisting of: This application is a continuation of U.S. patent application Ser. No. 13/760,154, filed Feb. 6, 2013, the disclosure of which is incorporated by reference herein in its entirety.The present invention relates to on-chip magnetic devices, and more specifically, to systems and methods for laminating magnetic cores for on-chip magnetic devices such as inductors and transformers.On-chip magnetic ...

GRANULARITY IN OVERLYING MAGNETIC AND NON-MAGNETIC LAYERS

Provided herein is an apparatus including a layer stack. A first granular metal layer overlies the layer stack, wherein the first granular metal layer includes first metal grains separated by voids. A first granular non-metal layer overlies the first granular metal layer, wherein the first granular non-metal layer includes first non-metal grains separated by a first segregant. A second granular non-metal layer overlies the first granular non-metal layer, wherein the second granular non-metal layer includes second non-metal grains separated by a second segregant. A second granular metal layer overlies the second granular non-metal layer, wherein the second granular metal layer includes second metal grains separated by a third segregant. 1. An apparatus comprising:a layer stack;a first granular metal layer overlying the layer stack, wherein the first granular metal layer includes first metal grains separated by voids;a first granular non-metal layer overlying the first granular metal layer, wherein the first granular non-metal layer includes first non-metal grains separated by a first segregant;a second granular non-metal layer overlying the first granular non-metal layer, wherein the second granular non-metal layer includes second non-metal grains separated by a second segregant; anda second granular metal layer overlying the second granular non-metal layer, wherein the second granular metal layer includes second metal grains separated by a third segregant.2. The apparatus of claim 1 , wherein a center to center distance of the first metal grains is the same as the second metal grains.3. The apparatus of claim 1 , wherein the first non-metal grains include a different crystal structure than the second non-metal grains.4. The apparatus of claim 1 , wherein the first non-metal grains include a hexagonal structure claim 1 , and the second non-metal grains include a NaCl-structure.5. The apparatus of claim 1 , wherein the first metal grains include a hexagonal close- ...

Magnetic recording medium with multiple exchange coupling layers and small grain magnetic layers

According to one embodiment, a magnetic recording medium includes: a substrate; and a magnetic recording layer structure formed above the substrate. The magnetic recording layer structure includes five or more magnetic recording layers and four or more nonmagnetic exchange coupling layers, where the magnetic recording layers and the nonmagnetic exchange coupling layers are arranged in an alternating pattern, and where the magnetic recording layers are separated from each other by least one of the nonmagnetic exchange coupling layers. The magnetic recording layer positioned closest to the substrate has each of the following: an average magnetic grain pitch of about 8.3 nm or less, a magnetic anisotropy field (H k ) value of greater than or equal to about 20 kOe, and a thickness that is about 40% of a total thickness of the magnetic recording layer structure.

FEROMAGNETICALLY COUPLED MAGNETIC RECORDING MEDIA

A ferromagnetically coupled magnetic recording medium having a first ferromagnetic layer, a second ferromagnetic layer, and a ferromagnetic coupling layer to ferromagnetically couple the first ferromagnetic layer to the second ferromagnetic layer is used as stable magnetic media with high MT in high density recording hard drives. The first ferromagnetic layer is the stabilization layer and the second ferromagnetic layer is the main recording layer. The ferromagnetic coupling layer comprises a conductive material having a thickness which produces ferromagnetic coupling between said first ferromagnetic layer and said second ferromagnetic layer via the RKKY interaction. 1. An apparatus , comprising:a first ferromagnetic layer overlying a substrate; a first, nonmagnetic spacer layer overlying the first ferromagnetic layer;', 'a magnetic interface layer overlying the first spacer layer; and', 'a second, nonmagnetic spacer layer overlying the interface layer; and, 'the ferromagnetic coupling layer comprising, 'a ferromagnetic coupling layer overlying the first ferromagnetic layer,'} 'wherein the ferromagnetic coupling layer ferromagnetically couples the first ferromagnetic layer and the second ferromagnetic layer.', 'a second ferromagnetic layer overlying the ferromagnetic coupling layer,'}2. The apparatus of claim 1 , wherein the ferromagnetic coupling layer ferromagnetically couples the first ferromagnetic layer and the second ferromagnetic layer via RKKY coupling.3. The apparatus of claim 1 , wherein the interface layer is Fe or an Fe-based alloy comprising one or more added elements selected from a group consisting of Cr claim 1 , Pt claim 1 , Ta claim 1 , B claim 1 , Mo claim 1 , Ru claim 1 , Si claim 1 , Ge claim 1 , Nb claim 1 , and Ni.4. The apparatus of claim 1 , wherein the interface layer is Co or an Co-based alloy comprising one or more added elements selected from a group consisting of Cr claim 1 , Pt claim 1 , Ta claim 1 , B claim 1 , Mo claim 1 , Ru claim 1 ...

MAGNETIC RECORDING MEDIUM, METHOD FOR MANUFACTURING SAME, AND FILM-FORMING APPARATUS

A magnetic recording medium including a base material which has flexibility, and a laminated film, in which a variation in magnetic characteristics is within ±10% over a division of 300 m in a longitudinal direction of the base material. 1. A magnetic recording medium comprising:a base material which has flexibility; anda laminated film,wherein a variation in magnetic characteristics is within ±10% over a division of 300 m in a longitudinal direction of the base material.2. The magnetic recording medium according to claim 1 ,wherein the laminated film includes a lower coating layer and a perpendicular recording layer.3. The magnetic recording medium according to claim 2 ,wherein the lower coating layer includes Ti and Cr, andthe perpendicular recording layer has a granular structure where particles which include Co, Pt, and Cr are separated by an oxide.4. The magnetic recording medium according to claim 2 ,wherein the lower coating layer has an amorphous state.5. The magnetic recording medium according to claim 2 ,wherein the laminated film further includes an intermediate layer.6. The magnetic recording medium according to claim 5 ,wherein the intermediate layer includes Ru or NiW.7. The magnetic recording medium according to claim 2 ,wherein the laminated film further includes at least one type of layer out of a soft magnetic layer and a CAP layer.8. The magnetic recording medium according to claim 1 ,wherein a variation in magnetic characteristics is within ±5% over a division of 300 m or more in the longitudinal direction of the base material.9. The magnetic recording medium according to claim 1 ,{'sub': '50', 'wherein the magnetic characteristics are a holding power Hc, a squareness ratio Rs, and an orientation strength Δθ.'}10. The magnetic recording medium according to claim 1 ,wherein the laminated film is film-formed by a physical deposition method.11. The magnetic recording medium according to claim 10 ,wherein the physical deposition method is a ...

PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A perpendicular magnetic recording medium includes a nonmagnetic substrate, an underlayer provided above the nonmagnetic substrate, and a perpendicular recording layer provided above the underlayer. The perpendicular recording layer includes a first magnetic layer including Co and Pt and having a granular structure, and a second magnetic layer having magnetic and ferroelectric properties. 1. A perpendicular magnetic recording medium comprising:a nonmagnetic substrate;an underlayer provided above the nonmagnetic substrate; anda perpendicular recording layer provided above the underlayer,wherein the perpendicular recording layer includes a first magnetic layer including Co and Pt and having a granular structure, and a second magnetic layer having magnetic and ferroelectric properties.2. The perpendicular magnetic recording medium as claimed in claim 1 , wherein the first magnetic layer is provided on a side closer to the nonmagnetic substrate than the second magnetic layer.3. The perpendicular magnetic recording medium as claimed in claim 1 , wherein the second magnetic layer is made of (BiBa)FeO claim 1 , where “a” is in a range of 0.3 to 0.5.4. The perpendicular magnetic recording medium as claimed in claim 1 , wherein the second magnetic layer is made of Bi(FeMn)O claim 1 , where “b” is in a range of 0.3 to 0.8.5. The perpendicular magnetic recording medium as claimed in claim 1 , wherein the second magnetic layer is made of (BiBa)(FeMn)O claim 1 , where “a” is in a range of 0.3 to 0.5 claim 1 , and “b” is in a range of 0.3 to 0.8.6. The perpendicular magnetic recording medium as claimed in claim 1 , further comprising:a nonmagnetic metal layer provided between the first magnetic layer and the second magnetic layer.7. The perpendicular magnetic recording medium as claimed in claim 1 , wherein the first magnetic layer includes ferromagnetic particles including Pt and Co claim 1 , and a boundary forming material including at least one material selected from a group ...

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A magnetic recording medium includes a substrate, a magnetic layer including a FePt alloy having a L1type structure, and a plurality of underlayers arranged between the substrate and the magnetic layer, wherein at least one of the plurality of underlayers includes TiO. 1. A magnetic recording medium comprising:a substrate;{'sub': '0', 'a magnetic layer including a FePt alloy having a L1type structure; and'}a plurality of underlayers arranged between the substrate and the magnetic layer,{'sub': '2', 'wherein at least a first underlayer amongst the plurality of underlayers includes TiO.'}2. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers includes a second underlayer formed by Cr or an alloy having a BCC (Body-Centered Cubic) structure and including Cr as its primary component, andthe first underlayer is provided on the second underlayer.3. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers includes a second underlayer formed by a material having a BCC (Body-Centered Cubic) structure, andthe first underlayer is provided on the second underlayer.4. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers includes a second underlayer formed by a material having a first NaCl type structure, andthe first underlayer is provided on the second underlayer.5. The magnetic recording medium as claimed in claim 4 , wherein the material is MgO.6. The magnetic recording medium as claimed in claim 1 , wherein the magnetic layer is provided directly on the first underlayer.7. The magnetic recording medium as claimed in claim 1 , whereinthe plurality of underlayers includes a second underlayer formed by a material having a second NaCl type structure,the second underlayer is provided on the first underlayer, andthe magnetic layer is provided on the second underlayer.8. The magnetic recording medium as claimed in claim 7 , wherein the material is MgO.9. The magnetic recording ...

HEAT ASSISTED MAGNETIC RECORDING (HAMR) MEDIA WITH EXCHANGE TUNING LAYER

An apparatus is disclosed. The apparatus includes a storage layer, an exchange tuning layer, and a write layer. The storage layer is magnetic. The exchange tuning layer is disposed over the storage layer. The exchange tuning layer is weakly magnetic. The write layer is disposed over the exchange tuning layer. The write layer is magnetic and the exchange tuning layer magnetically weakens magnetic coupling between the storage layer and the write layer. 1. An apparatus comprising:a storage layer, wherein the storage layer is magnetic;an exchange tuning layer disposed over the storage layer, wherein the exchange tuning layer is weakly magnetic; anda write layer disposed over the exchange tuning layer, wherein the write layer is magnetic, and wherein the exchange tuning layer magnetically weakens magnetic coupling between the storage layer and the write layer when heated during a write process of heat assisted magnetic recording (HAMR) media.2. The apparatus of claim 1 , wherein a material of the storage layer is selected from an L1crystalline structure group consisting of FePt claim 1 , FePtCu claim 1 , FePtAg claim 1 , FePtCuAg claim 1 , FePtMo claim 1 , FePtCo claim 1 , FePtNi claim 1 , CoPt claim 1 , FeCoPt claim 1 , and CoPdPt and wherein a material of the write layer is selected from a cubic structure group consisting of FePt claim 1 , FePtMo claim 1 , FePtCo claim 1 , FePtNi claim 1 , CoPt claim 1 , FeCoPt claim 1 , CoNiFe claim 1 , CoFe claim 1 , and CoCrPt claim 1 , CoCrPtRu claim 1 , and wherein a segregant for each of the storage layer and the write layer is selected from a group consisting of B claim 1 , C claim 1 , SiC claim 1 , BC claim 1 , TiC claim 1 , TaC claim 1 , BN claim 1 , SiN claim 1 , TiN claim 1 , SiO claim 1 , BO claim 1 , WO claim 1 , TaO claim 1 , and TiO.3. The apparatus of claim 1 , wherein a material of the exchange tuning layer includes PtCo claim 1 , wherein Co is magnetic with high Curie temperature claim 1 , and wherein segregant for ...

MAGNETIC RECORDING MEDIUM

The invention provides a magnetic recording medium including a magnetic layer or a magnetic recording layer having a granular structure in which magnetic crystal grains are well separated from each other. The magnetic recording medium includes a substrate, a seed layer, and a magnetic recording layer, wherein the magnetic recording layer includes a first magnetic layer which is a continuous film consisting of an ordered alloy, and a second magnetic layer having a granular structure consisting of magnetic crystal grains consisting of an ordered alloy and a non-magnetic crystal grain boundary, and the seed layer consists of a material selected from the group consisting of an NaCl-type compound, a spinel-type compound, and a perovskite-type compound. 1. A magnetic recording medium , comprising:a substrate;a seed layer disposed on the substrate, and consisting of a material selected from the group consisting of an NaCl-type compound, a spinel-type compound, and a perovskite-type compound; and a first magnetic layer formed of a continuous film, and being made of an ordered alloy, and', 'a second magnetic layer having a granular structure including magnetic crystal grains that is made of an ordered alloy and a non-magnetic crystal grain boundary., 'a magnetic recording layer including'}2. The magnetic recording medium according to claim 1 , whereinthe NaCl-type compound is selected from the group consisting of MgO, ZnO, CaO, SrO, TiN, CrN, and ZrN,{'sub': 2', '4', '2', '4', '2', '4', '2', '4', '4', '3, 'the spinel-type compound is selected from the group consisting of MgAlO, FeAlO, ZnAlO, FeCrO, and MgCrO, and the perovskite-type compound has a general formula ABOwherein A is selected from the group consisting of Ba, Pb, Sr, Mg and Ca, and B is selected from the group consisting of Ti, Zr, Hf and Sn.'}3. The magnetic recording medium according to claim 1 , wherein the non-magnetic crystal grain boundary in the second magnetic layer comprises an oxide.4. The magnetic ...

PATTERNED PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH ULTRATHIN NOBLE METAL INTERLAYER

A bit-patterned media (BPM) magnetic recording disk has a cobalt (Co) alloy recording layer (RL), a ruthenium (Ru) containing underlayer (UL), and a noble metal film (NMF) as an interlayer between the RL and the UL. The RL is preferably oxide-free and is a Co alloy, like a CoPtCr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the RL. The NMF is an element from the Pt group (Pt, Pd, Rh, Ir) and Au, or an alloy of two or more of these elements, and has a thickness less than 3.0 nm, preferably between 0.3 and 1.0 nm. The NMF does not interrupt the epitaxial growth of the RL and has little to no effect on the distribution of the RL c-axis orientation. The NMF increases the coercivity (Hc) and perpendicular magnetic anisotropy constant (K) of the RL. 1. A patterned perpendicular magnetic recording medium comprising:a substrate;a nonmagnetic Ru-containing underlayer on the substrate;a perpendicular magnetic recording layer of an alloy comprising cobalt and platinum; anda noble metal film between the Ru-containing layer and the magnetic recording layer, the noble metal film consisting of one or more of Pt, Pd, Rh, Ir and Au and having a thickness less than or equal to 3.0 nm; andwherein the magnetic recording layer is patterned into a plurality of discrete islands.2. The medium of wherein the noble metal film has a thickness greater than or equal to 0.3 nm and less than or equal to 1.0 nm.3. The medium of wherein the noble metal film is a discontinuous film on the Ru-containing layer claim 1 , whereby the magnetic recording layer is in contact with the Ru-containing layer and the noble metal film.4. The medium of wherein the noble metal film is located within the discrete islands.5. The medium of wherein the noble metal film is located in spaces between the discrete islands.6. The medium of wherein the noble metal film consists essentially of Pt.7. The medium of further comprising an ...

MAGNETIC TAPE AND MAGNETIC RECORDING AND REPRODUCING DEVICE

The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40. 1. A magnetic tape comprising:a non-magnetic support; anda magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,wherein the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide,a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, andan absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.2. The magnetic tape according to claim 1 ,wherein the difference Nxy-Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40.3. The magnetic tape according to claim 1 ,wherein the C—H derived C concentration is 45 atom % to 80 atom %.4. The magnetic tape according to claim 1 ,wherein the C—H derived C concentration is 45 atom % to 70 atom %.5. The magnetic tape according to claim 1 , ...

MAGNETIC RECORDING MEDIUM WITH MULTIPLE EXCHANGE COUPLING LAYERS AND SMALL GRAIN MAGNETIC LAYERS

A magnetic recording medium is provided that includes a recording layer structure including a first magnetic recording layer, a second magnetic recording layer, a third magnetic recording layer, a fourth magnetic recording layer, and a plurality of nonmagnetic exchange coupling layers. The first magnetic recording layer is closest to a substrate and the fourth magnetic recording layer is farthest from the substrate. An amount of Co in the first magnetic recording layer is greater than or equal to the amount of Co in the second magnetic recording layer, the third magnetic recording layer, and the fourth magnetic recording layer. 1. A magnetic recording medium comprising: a first magnetic recording layer;', 'a second magnetic recording layer;', 'a third magnetic recording layer;', 'a fourth magnetic recording layer; and', 'a plurality of nonmagnetic exchange coupling layers,, 'a recording layer structure comprisingwherein the first magnetic recording layer is closest to a substrate and the fourth magnetic recording layer is farthest from the substrate; andwherein an amount of Co in the first magnetic recording layer is greater than or equal to the amount of Co in the second magnetic recording layer, the third magnetic recording layer, and the fourth magnetic recording layer.2. The magnetic recording medium of claim 1 , wherein the plurality of nonmagnetic exchange coupling layers comprises:a first nonmagnetic exchange coupling layer between the first magnetic recording layer and the second magnetic recording layer;a second nonmagnetic exchange coupling layer between the second magnetic recording layer and the third magnetic recording layer;a third nonmagnetic exchange coupling layer between the third magnetic recording layer and the fourth magnetic recording layer; anda fourth nonmagnetic exchange coupling layer above the fourth magnetic recording layer.3. The magnetic recording medium of claim 1 , further comprising a fifth magnetic recording layer above the fourth ...

FERRIMAGNETIC PARTICLE POWDER AND MANUFACTURING METHOD THEREFOR, AND MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD THEREFOR

A magnetic recording medium includes: a substrate; and a magnetic layer including a ferrimagnetic particle powder. A product (V×SFD) of a particle volume V and a holding force distribution SFD of the ferrimagnetic particle is equal to or less than 2500 nm. 1. A magnetic recording medium comprising:a substrate; anda magnetic layer including a ferrimagnetic particle powder,{'sup': '3', 'wherein a product (V×SFD) of a particle volume V and a holding force distribution SFD of the ferrimagnetic particle is equal to or less than 2500 nm.'}2. The magnetic recording medium according to claim 1 , wherein the ferrimagnetic particle is a hexagonal ferrite particle.3. The magnetic recording medium according to claim 1 , wherein the ferrimagnetic particle has an axial ratio of equal to or less than 3.9.4. The magnetic recording medium according to claim 1 , wherein the ferrimagnetic particle has a particle volume of equal to or less than 6000 nm.5. The magnetic recording medium according to claim 1 , wherein the ferrimagnetic particle has a holding force distribution of equal to or less than 0.5.6. The magnetic recording medium according to claim 1 , wherein a ratio (Vact/V) of an activation volume Vact to a particle volume V for the ferrimagnetic particle is equal to or less than 1.5.7. The magnetic recording medium according to claim 2 , wherein the hexagonal ferrite particle contains Ba.8. The magnetic recording medium according to claim 7 , wherein the hexagonal ferrite particle further contains at least one selected from the group consisting of Co claim 7 , Zn claim 7 , and Ti.9. A ferrimagnetic particle powder claim 7 , wherein a product (V×SFD) of a particle volume V and a holding force distribution SFD is equal to or less than 2500 nm.11. The method of manufacturing a ferrimagnetic particle powder according to claim 10 , wherein the temperature T [° C.] and the time t [h] of the heat treatment fall within a range defined by claim 10 , in addition to the formulas (1) to ( ...

Magnetic Disk of a Data Storage Device with Tempered Growth of Magnetic Recording Layer

In one aspect, a magnetic data storage device comprises a template layer, an underlayer, and a magnetic recording layer. The template layer includes a patterned array of protruding features. The underlayer is formed on the patterned array of protruding features of the template layer. The underlayer includes an array pattern of protruding features that aligns with the patterned array of protruding features of the template layer. The magnetic recording layer is formed on the underlayer. The magnetic recording layer includes columnar grains of magnetic material separated by grain boundaries of non-magnetic material, with each columnar grain being on a protruding feature of the array pattern of the underlayer, and the grain boundaries being in trenches between the protruding features of the array pattern of the underlayer. 1. A magnetic disk of a data storage device , the magnetic disk comprising:a template layer with a patterned array of protruding features;an underlayer formed on the patterned array of protruding features of the template layer, the underlayer having an array pattern of protruding features that aligns with the patterned array of protruding features of the template layer; anda magnetic recording layer formed on the underlayer, the magnetic recording layer comprising columnar grains of magnetic material separated by grain boundaries of non-magnetic material, with each columnar grain being on a protruding feature of the array pattern of the underlayer, and the grain boundaries being in trenches between the protruding features of the array pattern of the underlayer.2. The magnetic disk of claim 1 , further comprising:a substrate comprising a single-crystal silicon wafer, a wafer with one or more oxide layers, an aluminum substrate, or a glass substrate; andan adhesion layer deposited on the substrate;wherein the template layer is formed on the adhesion layer.3. The magnetic disk of claim 1 , further comprising:a substrate comprising a single-crystal ...

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS

A magnetic recording medium includes a substrate, a barrier layer, a crystal grain size control layer, and a magnetic layer that are arranged in this order. The barrier layer includes at least one of oxides, nitrides, and carbides, and the crystal grain size control layer is a crystalline layer including Ag and having an average thickness in a range of 0.1 nm to 1 nm. The barrier layer makes contact with the crystal grain size control layer, and the magnetic layer includes an alloy having a L1crystal structure and a (001) face orientation. 1. A magnetic recording medium comprising:a substrate, a barrier layer, a crystal grain size control layer, and a magnetic layer that are arranged in this order,wherein the barrier layer includes at least one of oxides, nitrides, and carbides,wherein the crystal grain size control layer is a crystalline layer including Ag and having an average thickness in a range of 0.1 nm to 1 nm,wherein the barrier layer makes contact with the crystal grain size control layer, and{'sub': '0', 'wherein the magnetic layer includes an alloy having a L1crystal structure and a (001) face orientation.'}2. The magnetic recording medium as claimed in claim 1 , wherein the crystal grain size control layer includes crystalline point-like precipitates including Ag.3. The magnetic recording medium as claimed in claim 1 , wherein the crystal grain size control layer includes one or more added materials selected from a group consisting of B claim 1 , C claim 1 , Si claim 1 , Ge claim 1 , Cu claim 1 , Ni claim 1 , Ti claim 1 , Sn claim 1 , BN claim 1 , and MgO.4. The magnetic recording medium as claimed in claim 3 , wherein the crystal grain size control layer includes the one or more added materials in a range of 5 mol % to 60 mol %.5. The magnetic recording medium as claimed in claim 4 , wherein the barrier layer includes one or more materials selected from a group consisting of MgO claim 4 , TiO claim 4 , NiO claim 4 , TiN claim 4 , TaN claim 4 , HfN claim ...

Magnetic recording medium and magnetic recording apparatus using the same

Magnetic recording medium includes at least two layers having different magnetic anisotropy constants formed on a substrate and the perpendicular magnetic anisotropy of the second magnetic film of those magnetic films, far from the substrate surface, made equal to or larger than that of the first magnetic film near to the substrate surface, thus improving the magnetic isolation of the first magnetic film near to the substrate surface.

Exchange decoupled cobalt/noble metal perpendicular recording media

A magnetic recording medium of the perpendicular type, for a disc drive. The magnetic recording material includes a Cobalt alloy layer interspersed with a noble metal layer. The initial graded material is paramagnetic to increase to the magnetic properties of perpendicular recording media into increase the signal to noise ratio. The final recording layer has 8-20 alternating multilayer of the Cobalt alloy and a noble metal.

Magnetic recording disk with composite perpendicular recording layer

A composite perpendicular magnetic recording disk has two distinct magnetic layers formed on the disk substrate, each with strong perpendicular magnetic anisotropy, that are strongly exchange coupled perpendicularly to each other across their interface. The first layer is a CoCr granular layer formed on a growth-enhancing sublayer, such as titanium, so as to have strong perpendicular magnetic anisotropy. The second layer is a continuous layer, preferably a continuous multilayer of Co/Pt or Co/Pd palladium formed on top of the granular layer. An interface layer, such as a layer of platinum or palladium, depending on whether the top multilayer is Co/Pt or Co/Pd, respectively, may be located between the two layers to enhance the growth of the continuous multilayer.

Magnetic recording medium

A magnetic recording medium comprising a non-magnetic substrate having thereon a non-magnetic underlayer, a magnetic recording layer, a soft magnetic layer and a protective layer, wherein the coercivity is 2,500 Oe or more and the thickness of the soft magnetic layer is from 5 to 50 Å.

Perpendicular magnetic recording media

There is provided a perpendicular magnetic recording medium comprising a non-magnetic layer having a face-centered cubic structure, an antiferromagnetic layer provided on the non-magnetic layer, a soft magnetic underlayer provided on the antiferromagnetic layer, and a perpendicular recording layer provided on the soft magnetic underlayer, which magnetic recording medium makes it possible to realize a recording density not less than 5.0 Gb/in 2 and makes the error rate thereof low while suppressing the spike noise.

Perpendicular magnetic recording medium and process of production thereof

A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.

Magnetic recording medium

A magnetic recording medium comprising a flexible support and a magnetic layer selected from a cobalt/palladium multilayer film and a cobalt/platinum multilayer film.

Perpendicular magnetic recording media

Perpendicular magnetic media are described for use in magnetic recording and data storage. For example, a magnetic medium may include a substrate, a layer of titanium formed over the substrate, a layer of platinum formed over the layer of titanium, and a multi-layered magnetic stack formed over the layer of platinum. The layer of titanium provides a seed layer to improve the crystal texture of the layer of platinum. The layer of platinum, in turn, provides a seed layer to improve the crystal texture of the multi-layered magnetic stack. In this manner, high perpendicular magnetic anisotropy can be achieved and storage densities can be increased.

Multilayer magnetic recording media including composite layer with discontinuous magnetic phase and continuous non-magnetic phase

Multilayer magnetic structures comprising composite layers and spacer layers are disclosed. The composite layers include a discontinuous magnetic phase such as Co, Ni or Fe platelets, and a continuous nonmagnetic phase such as C, AlO x , SiO x , ZrO x , Cu, Ag and Au. The spacer layers may comprise Pt, Pd, Au or the like. The composite layers and spacer layers may be made by sputtering. The multilayer structures are useful as magnetic recording layers of magnetic recording media. In one embodiment, the recording media comprises a perpendicular magnetic recording medium including a substrate, a soft magnetic underlayer, a seed layer and the multilayer structure.

Perpendicular magnetic recording medium and method of manufacturing the same

A perpendicular magnetic recording medium has high recording density and excellent read-write characteristics. The recording medium has a magnetic layer of a multilayered lamination structure composed of laminated cobalt layers mainly containing cobalt and noble metal layers of platinum or palladium. At least one of the cobalt layers and the noble metal layers contains at least one element selected from the group consisting of Ru, Ta, Nb, Mo, Mn, Cr, Si, and Ni, or an oxide, in a concentration ranging from 1 to 15 mol %. The magnetic layer is formed on an underlayer of ruthenium or the like for reducing magnetic interaction between the magnetic particles in the magnetic layer. The surface of the underlayer is treated for oxygen adsorption before depositing the magnetic layer to suppress magnetic interaction between the magnetic particles in the magnetic layer.

NiCr and NiFeCr seed layers for perpendicular magnetic recording media

Perpendicular magnetic media are described for use in magnetic recording and data storage. Seed layer compositions are described which can facilitate perpendicular magnetic anisotropy in subsequently deposited magnetic layers. In particular, nickel-iron-chromium (NiFeCr) alloys or nickle-chromium (NiCr) alloys can be used as seed layers which cause a subsequently multi-layered magnetic stack to assume perpendicular magnetic anisotropy. In this manner, high perpendicular magnetic anisotropy can be achieved and storage densities of media may be increased.

Perpendicular magnetic recording medium and method for manufacturing the same

There is provided a perpendicular magnetic recording medium which causes low media noise and achieves preferable read/write performance. A perpendicular magnetic layer is constructed such that first magnetic layers formed of Co or Co containing an oxide and second magnetic layers formed of Pt or Pd containing an oxide are layered. The perpendicular magnetic layer is provided on a non-magnetic substrate via a Ru underlayer containing oxygen. An alignment control layer formed of a Ni—Fe alloy is provided between the non-magnetic substrate and the underlayer to control the crystal alignment of the underlayer. A soft magnetic backing layer is provided between the substrate and the alignment control layer.

Perpendicular magnetic recording medium and method of manufacturing same

A perpendicular magnetic recording medium is disclosed that exhibits reduced media noise and enhanced thermal stability of recorded magnetization, and thus provides a medium of high recording density and excellent read-write performance. The perpendicular magnetic recording medium comprises a magnetic film on a nonmagnetic substrate. The magnetic film is a multilayered lamination film composed of alternately laminated first magnetic layers of cobalt and second magnetic layers of palladium, the second magnetic layers containing SiO 2 . By setting a ratio of Ku 2 to Ku to a value not smaller than a specified value, the compatibility between the ease of writing-in to the perpendicular magnetic recording medium by a head and the thermal stability of recorded magnetization is more improved.

Magnetic recording medium utilizing a multi-layered soft magnetic underlayer, method of producing the same and magnetic recording and reproducing device

A magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device are provided which can prevent spike noise and improve the error rate. The magnetic recording medium comprises at least one nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer to control the orientation of the layer formed directly above the same, and a perpendicular magnetic layer having an axis of easy magnetization which is oriented mainly perpendicularly to the nonmagnetic substrate. The soft magnetic underlayer is formed with a multilayer structure having at least two soft magnetic layers and one or more separation layers interposed between the soft magnetic layers, and at least one of the soft magnetic layers comprises a material with a structure having no magnetic domain walls.

Magnetic recording medium, method of producing the same and magnetic recording and reproducing device

The present invention aims to provide a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device which can prevent spike noise and improve the error rate. The present invention provides a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device comprising at least one nonmagnetic substrate, a soft magnetic underlayer 2 , an orientation control layer to control the orientation of the layer formed directly above the same, and a perpendicular magnetic layer having an axis of easy magnetization which is oriented mainly perpendicularly to the nonmagnetic substrate, and the soft magnetic underlayer 2 is formed with a multilayer structure having soft magnetic layers 21 A and 21 B, and one or more separation layers 22 interposed between the soft magnetic layers, and at least one of the soft magnetic layers 21 A and 21 B comprises a material with a structure having no magnetic domain walls.

Magnetic recording medium

A magnetic recording medium comprising a non-ferromagnetic substrate and a magnetic recording film formed on the substrate with an underlayer interposed therebetween, wherein the magnetic recording film comprises a plurality of magnetic layers and an interlayer made of a material having a B2 crystal structure or an interlayer made of Ru, disposed between the adjacent magnetic layers.

Magnetic media with improved exchange coupling

A magnetic recording medium includes a substrate, an underlayer, a lower magnetic layer formed on the underlayer, an intermediate layer, and an upper magnetic layer formed on the intermediate layer. The intermediate layer is typically Ru, and promotes antiferromagnetic coupling between the upper and lower magnetic layers. The upper and lower magnetic layers are typically Co alloys. The lower magnetic layer has a high saturation magnetization Ms to promote high exchange coupling between the upper and lower magnetic layers. The dynamic coercivity of the lower magnetic layer is lower than the exchange field to ensure rapid switching of the lower magnetic layer.

Zero to low magnetostriction, high coercivity, polycrystalline, Co-Pt magnetic recording media

An alloy of Co x Pt y with y between 10 and 30 at. % is made by sputtering with H c >500 Oe and 4πM s >5000 gauss, and zero magnetostriction. For 10 to 30 at. % Co the sputtered alloy has an H c of 500-1000 Oe with 4πM s of 4000-14000 gauss, a magnetostriction passing through zero between 20 and 30 at. % of Pt. For thickness below 1000Å H c is large (for the above range of alloys) and magnetization is also larger and coercivity varies as a direct function of Pt composition in the alloy up to 30 at. %.

Layered coherent structures for magnetic recording

Layered coherent structures characterized by periodic, alternating layers of cobalt and palladium and/or platinum exhibit perpendicular magnetic anistropy.

Vertical recording medium with improved perpendicular magnetic anisotropy due to influence of beta-tantalum underlayer

A thin film alloy disk for vertical magnetic recording has a cobalt-chromium-tantalum (CoCrTa) magnetic layer with perpendicular magnetic anisotropy deposited on an underlayer of beta-tantalum (β-Ta). The β-Ta layer is deposited on a suitable substrate, such as silicon, which is compatible with the formation of the beta phase of tantalum. The highly preferred orientation of the β-Ta film on the substrate and the incorporation of Ta in the magnetic film results in the magnetic film having improved perpendicular magnetic anisotropy, high perpendicular coercivity and low horizontal coercivity. A nickel-iron (NiFe) layer may be deposited between the substrate and the β-Ta underlayer to provide a magnetic flux return path.

Magnetic recording medium with an underlayer and a cobalt-based magnetic layer

An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coercivity substantially greater than prior CoPt thin film metal alloy media. A tungsten underlayer between the substrate and the CoPt magnetic layer improves the coercivity above that of media wiht conventional underlayers, such as chromium. The coercivity of the CoPt layer can be increased even further if the CoPt film is deposited in such a manner as to form an intermetallic compound of Co 3 W in the interface region between the tungsten underlayer and the CoPt magnetic layer. The tungsten underlayer also improves the magnetic properties of the media when the magnetic layer is an alloy of cobalt-platinum-chromium (CoPtCr).

Vertical magnetic recording medium with multilayered magnetisable film structure

The present invention relates to a magnetic recording medium of the type which comprises a substrate (51) and a magnetisable film structure (50) formed from a plurality of films supported on the substrate. A medium in accordance with the invention is characterised in that each film comprises a layer (30 - 38) of non-magnetisable material and a layer (40 - 48) of a magnetisable metal alloy including cobalt and chromium formed on the layer of non-magnetisable material, whereby the magnetisable film structure has perpendicular magnetic anisotropy.

Magnetic recording medium

The invention provides a magnetic recording medium comprising a substrate of a nonmagnetic material bearing a thin magnetic layer with perpendicular anistropy. The magnetic thin layer comprises alternate layers of Pd and Co. The signal-to-noise ratio upon reading the stored information is considerably improved in that the thicknesses of the individual layers of Pd are between 0.2 and 2.0 nm and that the individual layers of Co consist of at least one monolayer of Co atoms and have thicknesses which are smaller than 0.3 nm. The thin magnet layer may be manufactured, for example, by electron beam vacuum vapor deposition of the individual layers of Pd and Co.

Multilayered vertical magnetic recording medium

A vertical magnetic recording medium is formed of multiple layers, each layer comprising a cobalt-platinum (CoPt) magnetic film formed on a hexagonal-close-packed (HCP) necleating film. The thickness of each CoPt film in each layer is sufficiently thin to assure that the film has perpendicular magnetic anisotropy. The magnetic properties of the multilayered magnetic film structure can be varied by varying the thickness of the individual films and the number of layers.

Magneto-optical recording medium

A magneto-optical recording medium comprises a transparent substrate, a magneto-optical recording layer formed on the transparent substrate and containing a rare earth metal-transition metal alloy, and a thin film containing at least either one of platinum and palladium and formed at least on one surface of the magneto-optical recording layer. Or, the magneto-optical recording medium comprises the transparent substrate, and a magneto-optical recording layer formed on the transparent substrate by alternately overlaying a plurality of thin layers containing a rare earth metal-transition metal alloy, and a plurality of thin layers containing at least either one of platinum and palladium.

Magnetic medium for longitudinal recording

The magnetic medium includes a magnetic under image layer which may be separated from the hard magnetic recording layer by a nonmagnetic buffer layer. Virtual magnetic images induced in the magnetic image layer reduce off-track magnetization seen by the recording head. Thus, interference caused by tracks adjacent to the track being read is reduced.

Magnetic recording medium

A magnetic recording medium (10, 13, 15, 17, 19, 21) having a substrate (8) and a vertical magnetization film (9, 12, 14, 16, 18, 20) formed on the substrate(8). The vertical magnetization film (9, 12, 14, 16, 18, 20) is composed of an artificial superlattice (9a, 12a, 14a, 16a, 18a, 20a) and a thin film (9b, 12b, 14b, 16b, 18b, 20b) alternately deposited on the substrate (8). The artificial superlattice is a Co/Pt or Co/Pd artificial superlattice which is composed of alternate Co and Pt or Pd layers deposited on the substrate. The thin film is a Pt or Pd or Co thin film. The vertical magnetization films present lower Curie points, higher residual flux densities and higher coercivity. By using the recording medium to thermo-magnetic printers, for example, a higher resolution and a smaller power consumption can be achieved.