Tohoku University

Kabushiki Kaisha Toshiba

Showa Denko K.k.

Tanaka Kikinzoku Kogyo K.k.

Ricoh Company, Ltd.

Toshiba Corporation

Toshiba Electron Tubes & Devices Co., Ltd.

Shin Saito

Migaku Takahashi

Tomoyuki Maeda

Akihiko Takeo

Atsushi Hashimoto

Yuzo Sasaki

Gohei Kurokawa

Shintaro Hinata

Toshiya Yamamoto

Kim Kong Tham

Tetsuya Kanbe

Lei Zhang

Itaru Fujimura

Kazuya Niwa

Takayuki Fukushima

Hisato Shibata

Takehiro Yamaguchi

Shigeyoshi Misawa

Tomoo Shige

Toshiyuki Kawasaki

Ryousuke Kushibiki

Shinichi Ishibashi

Masakiyo Tsunoda

Tomoyuki Ogawa

Akira Kikitsu

Hidero Anno

Yuji Murakami

Chen Xu

Ryuji Sakaguchi

Haruhisa Ohashi

Ken Inoue

Tatsu Komatsuda

Shingo Sasaki

Provided is a sputtering target with which it is possible to form a magnetic thin film having a high coercive force Hc. The sputtering target is a sputtering target that contains metallic Co, metallic Pt, and an oxide, wherein the sputtering target contains no metallic Cr except inevitable impurities, the oxide has BO, and the sputtering target comprises 10 to 50 vol % of the oxide.

Sputtering target

A sputtering target for magnetic recording media capable of producing a magnetic thin film in which the magnetic crystal grains are micronized and the distance between the centers of the grains is reduced while good magnetic properties are maintained. The target including metallic Pt and an oxide, with the balance being metallic Co and inevitable impurities, wherein the Co is contained in a range of 70 at % to 90 at % and the Pt is contained in a range of 10 at % to 30 at % relative to a total of metallic components in the sputtering target for magnetic recording media, the oxide is contained in a range of 26 vol % to 40 vol % relative to a total volume of the sputtering target for magnetic recording media, and the oxide is composed of BOand one or more high-melting-point oxides having a melting point of 1470&#xb0; C. or higher and 2800&#xb0; C. or lower.

Sputtering target for magnetic recording media

A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having an L1structure. The substrate, the underlayer, and the magnetic layer are stacked in the recited order. The underlayer includes a first underlayer. The first underlayer includes magnesium oxide and one or more compounds selected from the group consisting of vanadium oxide, zinc oxide, tin oxide, vanadium nitride, and vanadium carbide, and a total content of the one or more compounds is in a range of 45 mol % to 70 mol %.

Heat-assisted magnetic recording medium and magnetic storage apparatus

Provided is a sputtering target with which it is possible to form a magnetic thin film having a high coercive force Hc and a process for production thereof. The sputtering target is a sputtering target comprising metallic Co, metallic Pt, and an oxide, wherein the sputtering target does not contain metallic Cr, and the oxide is WOand wherein the sputtering target comprises 25 to 50 at % of metallic Co relative to a total of metallic Co and metallic Pt.

Sputtering target and process for production thereof

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.

Magnetic recording medium and magnetic storage apparatus

There are provided a method for manufacturing a magnetic recording medium which is excellent in terms of both the recording and reproduction characteristics and the thermal fluctuation characteristics without reducing the density and hardness of the perpendicular magnetic layer; a magnetic recording medium; and a magnetic recording and reproducing apparatus with which an excellent recording density is achieved,

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

According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of &#x2212;6&#xd7;10erg/cmor less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.

Thin magnetic film, method of manufacturing the same, and high frequency oscillator, magnetic head, magnetic recording medium, and magnetic recording/reproducing apparatus using thin magnetic film

A perpendicular magnetic recording medium including at least a soft under layer, an orientation control layer, a magnetic recording layer and a protective layer on a non-magnetic substrate, wherein the orientation control layer is composed of three or more layers including a seed layer, a first intermediate layer and a second intermediate layer sequentially, formed in that order from the substrate side, the crystal grains that constitute the first intermediate layer are epitaxially grown on the crystal grains of the seed layer, the crystal grains that constitute the second intermediate layer are epitaxially grown on the crystal grains of the first intermediate layer, and the crystal grains that constitute the second intermediate layer are finer than the crystal grains that constitute the first intermediate layer.

Perpendicular magnetic recording medium, method for producing the same, and magnetic recording/reproducing device

An information recording apparatus has a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles. Summary information may be recorded for plural information recording parts.

Information recording apparatus and method, information reproducing method and fade-in memory, with summary information corresponding to plurality of information recording elements

In a perpendicular magnetic recording medium in which at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer and a protective layer are formed on a non-magnetic substrate in order from the bottom, the orientation control layer has a laminated structure of two or more layers including an intermediate layer and a seed layer which is disposed closer to the non-magnetic substrate than the intermediate layer. The seed layer includes two or more kinds of elements having a face-centered cubic structure, has face-centered cubic (111) plane crystals oriented in a direction perpendicular to a substrate surface, and has a pseudo-hexagonal structure.

Magnetic recording medium, method of manufacturing magnetic recording medium and magnetic recording reproducing apparatus

The present invention provides a magnetic recording medium which is capable of improving the perpendicular orientation of a perpendicular magnetic recording layer while maintaining a writing performance during recording and obtaining both an improvement in the perpendicular orientation and fine magnetic crystal particles with a uniform diameter, and which enables information to be recorded or reproduced at high density, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. A magnetic recording mediumaccording to the present invention includes at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer, and a protective layerformed on a non-magnetic substrate. The orientation control layerhas a seed layerand an intermediate layer. The seed layeris made of a Cu&#x2014;Ti alloy that has a face-centered cubic structure and includes Cu as a main component. The Cu&#x2014;Ti alloy has a (111) crystal plane oriented substantially perpendicular to the surface of the non-magnetic substrateand has a pseudo-hexagonal structure.

Magnetic recording medium, method of manufacturing the same, and magnetic recording/reproducing apparatus

A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

Magnetic recording medium, process for producing same, and magnetic recording reproducing apparatus

There are provided an anode target which generates X-rays due to electrons e being incident, an emitter source which emits electrons e to be incident into the anode target, a ring-shaped recoil electron capturing structure which surrounds an orbit of electrons e heading from the emitter source toward the anode target, and captures electrons e emitted from the emitter source and recoiled on the anode target, and a vacuum envelop which keeps at least a periphery of the anode target, the emitter source, and the recoil electron capturing structure at a predetermined degree of vacuum, and the recoil electron capturing structure has a first member formed from strengthened copper which is exposed to the inside of the recoil electron capturing structure, and a second member formed from copper which is disposed at the outside in the radial direction of the first member.

Rotation anode X-ray tube

An information recording apparatus comprises a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles.

Information recording method and apparatus using plasmonic transmission along line of ferromagnetic nano-particles with reproducing method using fade-in memory

An anode target is roratably supported by a rotating mechanism having a rotary body and a staionary body. A fitted portion between the rotary body and the stationary body is formed of bearing areas having dynamic pressure type sliding bearings and a non-bearing area having a clearance between the rotary body and the stationary body larger than that in the bearing areas. The rotary body facing the non-bearing area is positioned where a time for heat transfer from the anode target is shorter than the rotary body facing the bearing areas. Thus, the characteristics of heat radiation from the anode target can be improved, and a stable bearing operation can be maintained.

Growing community of inventors

Sendai, Japan

Shin Saito