Wd Media (Singapore) Pte. Ltd.

Wd Media, LLC

Yoshiaki Sonobe

Teiichiro Umezawa

Kong Kim

Koichi Wago

Junichi Yasumori

Masanori Aniya

Akira Shimada

Masato Kobayashi

Takahiro Onoue

Tadashi Tomonaga

Tsuyoshi Ozawa

Masaki Uemura

Shinichi Ishibashi

Chikara Takasu

A method of manufacturing a perpendicular magnetic recording medium 100 that includes forming a magnetic recording layer 122 on a disk base 110, then forming a resist layer 130 on the magnetic recording layer, and a patterning step of processing the resist layer so as to vary the thickness of the resist layer partially, thereby forming a predetermined pattern having a recessed part and a projected part. Finally, the method includes implanting ions into a plurality of layers including the magnetic recording layer with the resist layer interposed. At the ion implanting step, (1) one or more of said plurality of layers to be implanted with ions is determined by selectively applying an energy amount to implant ions, and (2) a total amount of ions to be implanted into each of said one or more of said plurality of layers is determined by selectively applying said energy amount for a respective time period for said one or more of said plurality of layers.

Method of manufacturing magnetic recording medium, and magnetic recording medium

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.

Magnetic recording medium including tailored exchange coupling layer and manufacturing method of the same

A method for manufacturing a magnetic recording medium includes the steps of (a) forming a perpendicular magnetic recording layer and (b) applying an ion beam to regions between tracks of the perpendicular magnetic recording layer so as to form separation regions for magnetically separating the tracks from each other. In the step (a), a continuous film layer composed of a multilayer film is formed, and CoB layers and Pd layers are laminated in the multilayer film. In the step (b), the CoB layers and the Pd layers are melted by the ion beam so as to form an alloy of metals contained in the CoB layers and the Pd layers to thereby form the separation regions.

Method for manufacturing magnetic recording medium

[Problem] An object is to provide a magnetic recording medium with improved HDI characteristics, such as impact resistance, and its manufacturing method. [Solution] A typical structure of a magnetic recording mediumaccording to the present invention includes, on a base, at least a magnetic recording layer, a protective layer, and a lubricating layer, wherein the magnetic recording layerincludes, in an in-plane direction, a magnetic recording partconfigured of a magnetic material and a non-recording partmagnetically separating the magnetic recording part, and a surface corresponding to the non-recording partprotuberates more than a surface corresponding to the magnetic recording part

Magnetic recording medium and magnetic recording medium manufacturing method

A perpendicular magnetic recording medium is disclosed that includes a substrate, a main recording layer, a reinforcing layer, and a continuous layer which are overlaid in this order on the substrate. The reinforcing layer is provided between the main recording layer and the continuous layer so as to improve the S/N ratio of the magnetic recording medium and reduce the write fringing effect. The reinforcing layer has a granular structure. The saturation magnetization Ms of the reinforcing layer is higher than the saturation magnetization of the main recording layer.

Perpendicular magnetic recording medium and perpendicular magnetic recording medium manufacturing method

The invention provides a magnetic disk that solves (1) a problem of cross-talk that cannot be solved even by an existing thermally assisted recording method or a discrete method (DTM or the like), (2) a problem of surface flatness, which an existing embedding type DTM or the like has, and (3) a problem of a difference in thermal expansion coefficient between materials when a thermally assisted method is applied to the DTM, and that (4) does not necessitate a special medium structure, and is excellent in a surface flatness and economically and functionally high in realizability. A DTM manufactured by ion implantation is excellent in the surface flatness, and can solve the cross-talk problem by conducting the thermally assisted recording at a temperature between a Curie temperature (Tcn) of a portion where ions are implanted (non-recording region) and a Curie temperature (Tcr) of a portion where ions are not implanted (recording region).

Thermally assisted magnetic recording disk with ion-implant facilitated non-magnetic regions, manufacturing method thereof, and magnetic recording method

It is an object to manufacture magnetic recording media with the high recording density. Since nonmagnetic portions () with a predetermined pattern are formed in a recording auxiliary layer () formed on a magnetic recording layer (), it is possible to actualize a magnetic recording medium where magnetic portions () and the magnetic recording layer () immediately below the portions () are recording units. The nonmagnetic portions () are formed by non-magnetization using ion implantation, and it is thereby possible to manufacture magnetic recording media with the high recording density.

Magnetic recording medium with guard layer between auxiliary and magnetic recording layers and manufacturing method of the magnetic recording medium

A magnetic diskfor use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate. The magnetic recording layer is composed of a ferromagnetic layerof a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layerhaving a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layerinterposed between the ferromagnetic layerand the stacked layer. After forming the ferromagnetic layeron the substrateby sputtering in an argon gas atmosphere, the stacked layeris formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer

Perpendicular magnetic recording disk and manufacturing method thereof

To provide a magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced and a manufacturing method of the medium, a method of manufacturing a magnetic recording medium of the invention is to manufacture a magnetic recording medium having 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, and is characterized by having an ion irradiation step of performing ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer.

Magnetic recording medium and manufacturing method of the same

A method for manufacturing a magnetic recording medium for perpendicular magnetic recording includes the steps of forming a first magnetic layer which has magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, forming a second magnetic layer which has magnetic grains exchange-coupled to the magnetic crystal grains, a grain boundary width of the magnetic grains being smaller than a grain boundary width of the magnetic crystal grains, and forming separation regions which magnetically separate tracks from each other in regions between the tracks of the magnetic recording medium in at least the second magnetic layer. The separation regions are disposed substantially only in the second magnetic layer of the first magnetic layer and the second magnetic layer.

Magnetic recording medium having patterned auxiliary recording layer and method for manufacturing such magnetic recording medium

[PROBLEMS] To provide a process for producing a magnetic recording medium, which can simultaneously realize increased high recording density, high impact resistance, and prevention of corrosion, by providing an underlayer which, even when formed at a low gas pressure, can exhibit a high level of coercive force. [MEANS FOR SOLVING PROBLEMS] A process for producing a perpendicular magnetic recording medium, comprising the step of forming a nonmagnetic underlayer () having a granular structure, in which crystal particles are grown in a column form, on a substrate, and forming a magnetic recording layer () having a granular structure in which magnetic particles are grown in a column form. The process is characterized in that the underlayer () is any one of CoCr or CoCrX (wherein X is a nonmagnetic material), CoCr-oxide, and CoCrX-oxide, and the film forming gas pressure of the underlayer () is not more than 4 Pa.

Method of manufacturing a perpendicular magnetic recording medium

A magnetic recording medium () has a substrate () and a perpendicular magnetic recording layer () formed over the substrate (). The perpendicular magnetic recording layer () has a granular layer () in which a magnetic signal is recorded and a continuous film layer () magnetically coupled to the granular layer (). The continuous film layer () has hard magnetic portions () formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer () and magnetic shield portions () formed between the hard magnetic portions (), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.

Magnetic recording medium, magnetic recording medium manufacturing method, and magnetic disk

A magnetic diskfor use in perpendicular magnetic recording, which includes an underlayer, a size-reduction promoting layer(nonmagnetic granular layer) of a granular structure, and a magnetic recording layerhaving a ferromagnetic layerof a granular structure. The size-reduction promoting layerhas an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayerand the ferromagnetic layer, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer

A perpendicular magnetic recording mediumadapted to be mounted in a perpendicular magnetic recording type hard disk drive and including a disk-shaped disk base, a soft magnetic layerformed on the disk base, and a perpendicular magnetic recording layerformed on the soft magnetic layer, wherein, at respective portions of the soft magnetic layer, directional distribution of easy magnetization axes of magnetic particles included In each of the respective portions is isotropic with respect to respective directions in the main surface of the soft magnetic layer

Magnetic recording medium having soft magnetic layer and perpendicular magnetic recording layer

A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.

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Tokyo, Japan

Yoshiaki Sonobe