Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Hgst Netherlands, B.v.

Hitachi Global Storage Technologies

Hitachi Storage Technologies Japan, Ltd.

Yoshibumi Matsuda

Masaaki Futamoto

Mikio Suzuki

Yotsuo Yahisa

Hisashi Takano

Yuzuru Hosoe

Yoshinori Miyamura

Kyo Akagi

Fumio Kugiya

Takeshi Nakao

Hirotsugu Fukuoka

Takayuki Munemoto

Tokuho Takagaki

Hiroyuki Suzuki

Yoshihiro Shiroishi

Nobuyuki Inaba

Kazumasa Takagi

Masaki Ohura

Koji Sakamoto

Sadao Hishiyama

Norikazu Tsumita

Tomoyuki Ohno

Toshio Kobayashi

Hideo Tanabe

Naoki Koyama

Kazuo Shiiki

Masahiro Kitada

Isamu Yuito

Ryoichi Nakatani

Noboru Shimizu

Tetsuya Kanbe

Eijin Moriwaki

Tomoo Yamamoto

Akira Kato

Akira Ishikawa

Noriyuki Shige

Kiwamu Tanahashi

Yukio Honda

Shinji Narishige

Hajime Aoi

Kenji Furusawa

Yasutaro Uesaka

Takaaki Shirakura

Kazusuke Yamanaka

Atsushi Nakamura

Makoto Koizumi

Yoshiyuki Hirayama

Ichiro Tamai

Toshiaki Tsuyoshi

Toshinori Ono

Takuji Ogawa

Nobumasa Nishiyama

Hiroyuki Kataoka

Kazuhisa Shiraishi

Shinji Fukaya

Naoto Endo

Kazuhiro Ura

Takeo Yamashita

Sadanori Nagaike

Yasushi Kitazaki

Jo Inagaki

Makoto Saito

Noriyuki Kumasaka

Masaaki Hayashi

Hideki Sawaguchi

Masukazu Igarashi

Katsuhiro Kuroda

Kenji Mori

Kazuetsu Yoshida

Hiroyuki Awano

Yasuhide Ouchi

Hiroshi Tani

Yosuke Seo

Mitsuhiro Shoda

Norihiro Okawa

Makoto Aihara

Joe Inagaki

Yoko Ogawa

Susumu Funamoto

Takao Yonekawa

Kouji Okazaki

Yoshio Gobara

Shinichiro Saitoh

Suzuki Hiroyuki

Takeshi Nakano

Enji Fujita

Hiroshi Akiyama

In one embodiment, a magnetic head includes a magnetoresistance effect sensor including a free layer, a hard bias magnetic film adapted for performing magnetic domain control of the free layer by biasing a magnetization direction of the free layer towards a predefined direction that is positioned on both sides of the free layer in a track-width direction, an upper shield positioned above the hard bias magnetic film and the magnetoresistance effect sensor; and an antiferromagnetic (AFM) layer positioned above the upper shield. The upper shield includes first and second upper shield layers, and an AFM coupling layer positioned between the first upper shield layer and the second upper shield layer that is adapted for antiferromagnetically coupling the first upper shield layer and the second upper shield layer, wherein a magnetization of the first upper shield layer is antiparallel with a magnetization of the hard magnetic bias layer.

Magnetic shield having improved resistance to the hard bias magnetic field

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Method for manufacturing magnetic head device

A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

Magnetic recording medium and magnetic recording and reproducing apparatus

A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

Magnetic recording media and magnetic recording system using the same

Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect

The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

Magnetic recording medium and magnetic recording apparatus

An ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N value is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25&#xb0; C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.

Magnetic recording medium possessing a fluctuation field of not less than 30 Oe

A magnetic recording medium includes a first underlying film of a NiTa alloy having a nonmagnetic amorphous structure and formed on a nonmagnetic substrate, and a second underlying film made of an alloy containing Cr and Ti, further a first magnetic film of a CoCrPt alloy, a nonmagnetic intermediate film of Ru and a second magnetic film of a CoCrPtB alloy that are serially formed over the first underlying film, wherein oxygen locally exists in an interface between the first underlying film and the second underlying film.

Magnetic recording medium and manufacturing method thereof

A magnetic recording medium includes an underlayer of a nonmagnetic alloy containing chromium and titanium, a magnetic layer of a Co&mdash;Cr&mdash;Pt&mdash;Ta or Co&mdash;Cr&mdash;Pt&mdash;B alloy, and an intermediate layer of a Co&mdash;Cr&mdash;Pt alloy and being disposed between the underlayer and the magnetic layer, thereby carrying out high-density information recording and reproducing operation.

Magnetic recording medium and magnetic disk apparatus using the same

A magnetic recording medium having first undercoating layers &prime; formed directly or via substrate face undercoating layers on a substrate , second undercoating layers &prime; directly formed on the first undercoating layers &prime;, magnetic films &prime; formed on the second undercoating layers &prime;, and protective films &prime; formed on the magnetic films &prime;. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G&deg; of the elements at the temperature of 250&deg; C. is large.

Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force difference

A magnetic recording medium for longitudinal recording with a low media noise, a high S/N ratio and high reliabilities in corrosion resistance is disclosed. By making a magnetic layer from a Co-based alloy comprising 1 to 35 at. % of at least one element selected from the group consisting of Pt and Ir, 1 to 17 at. % of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ge and Si, except for Si, whose concentration is 1 to 40 at. and 0.1 to 10 at. of oxygen, a magnetic recording medium for longitudinal recording having an inplane coercivity of 1,200 Oe or more and a coercive squares of not more than 0.85 is obtained. A process for producing the magnetic recording medium for longitudinal medium and a magnetic memory apparatus using the magnetic recording medium for longitudinal recording are also disclosed.

Magnetic recording media for longitudinal recording, process for producing the same and magnetic memory apparatus

A thin film magnetic recording medium including a magnetic layer having a fluctuation field defined as S/X , where S is magnetic viscosity and X is irreversible susceptibility X . The fluctuation field of the magnetic layer is not less than 15 oersteds.

Magnetic recording medium and magnetic recording and reproducing apparatus wherein the magnetic layer has a fluctuation of field; A or Hf of not less than 30 Oersteds

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Odawara, Japan

Yoshibumi Matsuda