Tohoku University

Other

Showa Denko K.k.

Kabushiki Kaisha Toshiba

Sony Corporation

Ricoh Company, Ltd.

Tdk Corporation

Smc Corporation

Fujitsu Corporation

Fuji Electric Co., Ltd.

Toda Kogyo Corporation

Tanaka Kikinzoku Kogyo K.k.

Anelva Corporation

Toshiba Corporation

Kabushiki Kaisha Hitachi Seisakusho

Migaku Takahashi

Shin Saito

Masakiyo Tsunoda

Tomoyuki Maeda

Akihiko Takeo

Akira Kikitsu

Yuzo Sasaki

Gohei Kurokawa

Masahiro Oka

Atsushi Hashimoto

David Djulianto Djayaprawira

Tomoyuki Ogawa

Nobukazu Ikeda

Kouji Nishino

Michio Yamaji

Yoshihiro Tsuchiya

Kiyoshi Noguchi

Tadahiro Ohmi

Itaru Fujimura

Tsuyoshi Tanikawa

Mikihisa Mizuno

Eiko Miyasato

Tomio Uno

Shigeyoshi Misawa

Naofumi Yasumoto

Toshiyuki Kawasaki

Makoto Inoue

Ryosuke Dohi

Soichi Sato

Hiroyuki Fukuda

Shinichi Ishibashi

Yuichi Sasaki

Takashi Abe

Satoru Yoshimura

Hiroki Shoji

Yasuyuki Yanai

Shinji Hara

Jun Yamada

Yuji Uehara

Takashi Shiba

Kazuyuki Tohji

Toshiya Yamamoto

Teiichi Miyauchi

Naoya Kobayashi

Kenji Yazawa

Ryuji Sakaguchi

Kazuyuki Sunaga

Kim Kong Tham

Ken Inoue

Shintaro Hinata

Tatsu Komatsuda

Yasuo Tateno

Satoshi Miura

Koujiro Komagaki

Yasunobu Ogata

Andrew Chak Chung Yu

Chammika Ruwan Polwatta Gallage

Jeyaderan Balachandran

Kaori Kohara

Kazuya Komiyama

Shingo Sasaki

Akira Kikuchi

Junichi Nakai

Katsuya Yokoyama

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

Ferromagnetic particles including an FeNcompound phase in an amount of not less than 80% as measured by M&#xf6;ssbauer spectrum and each having an outer shell in which FeO is present in the form of a film having a thickness of not more than 5 nm. Ferromagnetic particles may be made by subjecting iron oxide or iron oxyhydroxide having an average major axis diameter of 40 to 5000 nm and an aspect ratio (major axis diameter/minor axis diameter) of 1 to 200 as a starting material to dispersing treatment to prepare aggregated particles; subjecting the iron compound particles passed through a mesh to hydrogen reducing treatment at a temperature of 160 to 420&#xb0; C.; and then subjecting the resulting particles to nitridation treatment at a temperature of 130 to 170&#xb0; C.

Ferromagnetic particles and process for producing the same, and anisotropic magnet, bonded magnet and compacted magnet

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

A microwave oscillation element of the present invention includes a lamination main part in which an oscillating layer that is a magnetization free layer and that generates a high frequency electromagnetic field by an excitation of a spin wave, a nonmagnetic intermediate layer, a polarizer layer, and a reference layer that is to be a base magnetic layer of a spin transfer due to application of current are layered in this order. The oscillating layer is made of CoIr, the polarizer layer is configured of CoCr or CoRu; and the nonmagnetic intermediate layer is configured of Cr or Ru. As a result, the efficiency of the spin injection is improved and the microwave oscillation element where the oscillation efficiency is excellent can be realized.

Microwave oscillating element and thin film magnetic head therewith

The method of the present invention provides a magnetoresistance effect element, which is capable of having a high MR ratio, corresponding to high density recording and being suitably applied to a magnetoresistance device even though a barrier layer is thinned to reduce resistance of the magnetoresistance effect element. The method of producing the magnetoresistance effect element, which includes the barrier layer composed of an oxidized metal, a first magnetic layer contacting one of surfaces of the barrier layer and a second magnetic layer contacting the other surface thereof, comprises the steps of: laminating the barrier layer on the first magnetic layer with using a target composed of the oxidized metal; and laminating the second magnetic layer on the barrier layer. The barrier layer is annealed before laminating the second magnetic layer thereon.

Method of producing magnetoresistance effect element

An MR element in a CPP structure includes a spacer layer made of Cu, a magnetic pinned layer containing CoFe and a free layer containing CoFe that are laminated to sandwich the spacer layer. The free layer is located below the magnetic pinned layer. The free layer is oriented in a (001) crystal plane, the spacer layer is formed and oriented in a (001) crystal plane on the (001) crystal plane of the free layer. Therefore, in a low resistance area where an area resistivity (AR) of the MR element is, for example, lower than 0.3 &#x3a9;&#xb7;&#x3bc;m, an MR element that has a large variation of a resistance is obtained.

Magnetoresistive effect element in CPP-type structure and magnetic disk device

The invention provides a magnetic recording medium, and a magnetic recording and reproducing apparatus. The magnetic recording medium includes a substrate, an under layerformed on the substrate, a magnetic recording layerformed on the under layer, and a protective layerformed on the magnetic recording layer. The magnetic recording layeris composed of a primary recording layerand a secondary recording layerwhich are mutually exchange-coupled. The primary recording layerhas magnetic grains and a nonmagnetic material that surrounds the magnetic grains, and has a perpendicular magnetic anisotropy. The secondary recording layeris made of a material having a negative crystal magnetic anisotropy and its easy plane of the magnetization is a plane of the medium.

Magnetic recording medium having a secondary recording layer made of a material having a negative crystal magnetic anisotropy and magnetic recording and reproducing apparatus

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

Perpendicular magnetic recording media enabling high-density recording and reproduction of information, as well as a production process thereof, and a magnetic recording and reproducing apparatus, are provided. Perpendicular magnetic recording media, having at least a soft magnetic underlayer and perpendicular magnetic recording layer on a disc-shaped nonmagnetic substrate, in which the soft magnetic underlayer has at least two soft magnetic layers, and Ru or Re between the two soft magnetic layers, are provided; the easy axis of magnetization of the soft magnetic underlayer has a desired direction; the easy axis of magnetization of the soft magnetic underlayer is substantially distributed in a direction except a radial direction of the nonmagnetic substrate, and, the bias magnetic field of the antiferromagnetic coupling in the direction of the easy axis of magnetization of the soft magnetic underlayer is 10 Oersteds (790 A/m) or greater.

Perpendicular magnetic recording media, production process thereof, and perpendicular magnetic recording and reproducing apparatus

A working rod with a tip end extending into a vacuum process chamber and moving in the axial direction, two static-pressure gas bearings supporting the rod in the non-contact manner, and an internal moving body of a magnet coupling type driving mechanism driving the rod are housed in a rod housing cylindrical portion leading to the vacuum process chamber, and an exhaust portion by suction is provided at a part of the rod housing cylindrical portion so that the pressure of the rod housing cylindrical portion is lowered than the pressure of the vacuum process chamber by the exhaust from the exhaust portion.

Straight conveying device for vacuum

Growing community of inventors

Sendai, Japan

Migaku Takahashi