Fujitsu Corporation

Showa Denko K.k.

Isatake Kaitsu

Iwao Okamoto

Hisateru Sato

Akira Kikuchi

Masayoshi Shinohara

Ryo Kurita

Satoshi Igarashi

Shinya Sato

Yoshifumi Mizoshita

Minoru Takahashi

Takuya Uzumaki

E Noel Abarra

Ryosaku Inamura

Tohru Horie

A magnetic recording medium includes a non-magnetic granular layer, and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer.

Magnetic recording medium with a non-magnetic granular layer under a plurality of granular magnetic layers and storage apparatus

A magnetic recording medium includes a nonmagnetic granular layer that has a granular structure in which a plurality of nonmagnetic grains made of a nonmagnetic material are separated from one another by a Cr oxide. The magnetic recording medium further includes a magnetic granular layer that is formed on the nonmagnetic granular layer and has a granular structure in which a plurality of magnetic grains made of a magnetic material are separated from one another by a nonmagnetic material.

Magnetic recording medium and information storage apparatus

A magnetic recording medium includes; a base member; an underlayer formed on the base member; a main recording layer formed on the underlayer, and a writing assist layer formed on or under the main recording layer in contact with the main recording layer. The main recording layer has perpendicular magnetic anisotropy with an anisotropic magnetic field of Hand an inclination of a reversal part of a magnetization curve of a. The writing assist layer has an anisotropic magnetic field of Hand an inclination of a reversal part of a magnetization curve of a. The anisotropic magnetic fields Hand Hand the inclinations aand asatisfy H&#x3e;Hand a&#x3e;a.

Magnetic recording medium and magnetic recording device

The present invention relates to a magnetic recording medium for use in an external memory device of an information processing apparatus etc., and an object thereof is to reduce noise, achieve high coercive force, and use the substance as a magnetic recording medium for detecting signals in a magnetoresistance head. In the magnetic recording medium comprising the magnetic recording layer including ferromagnetic grains and a nonmagnetic substance , the improvement in structure comprises that the ferromagnetic grains are formed to have respectively an average grain diameter of 50 nm or less and not to be overlapped in the film thickness direction and to be isolated in the direction along a layer surface, and that a product of residual magnetization and a film thickness of the magnetic recording layer is less than or equal to 150 Gauss&bull;&mgr;m.

Magnetic recording medium

The present invention provides a high-density, low-noise magnetic recording medium. This magnetic recording medium includes a substrate, a non-magnetic underlayer formed on the substrate, and a magnetic recording layer formed on the underlayer. The magnetic recording layer contains cobalt as the main component, 10 atm % to 18 atm % of chromium, 5 atm % to 20 atm % of platinum, and 10 atm % to 20 atm % of boron.

A magnetic recording medium is constructed to include at least one exchange layer structure and a magnetic layer provided on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer. At least one of the ferromagnetic layer and the magnetic layer has a granular layer structure in which ferromagnetic crystal grains are uniformly distributed within a non-magnetic base material.

Magnetic recording medium and magnetic storage apparatus

A magnetic storage medium has a non-magnetic substrate and a recording layer. The recording layer comprises a non-magnetic matrix and crystal grains consisting of a ferromagnetic material. Each of the crystal grains dispersed in the recording layer is a columnar shaped grain which penetrates a suface of the recording layer and has height of 30 nm or less, and a mean value of grain sizes of the crystal grains in an internal direction of the recording layer is 15 nm or less. (K &middot;V)/(k &middot;T) is not less than 60. A mean value H of anisotropic magnetic fields of the plurality of crystal grains is 20 kOe or less.

Magnetic storage medium

There is provided a magnetic storage medium capable of recording information at high recording density and also to regenerating the information with a high quality of signal (high S/N ), and in addition contributing to the elongation of a life span of the recorded information. The magnetic storage medium comprises a non-magnetic substrate and a magnetic recording layer provided on the substrate. The magnetic recording layer has a ferromagnetic grain consisting of a ferromagnetic material and an antiferromagnetic matrix consisting of an antiferromagnetic material.

A magnetic recording medium comprising: a substrate; and a magnetic recording layer provided on the substrate, the magnetic recording layer being comprised of a thin film of a nonmagnetic material with crystal grains of Co.sub.100-x Pt.sub.x, wherein 10.ltoreq..times.&lt;20, having an f.c.c. structure and an average grain diameter of not more than 50 nm being substantially uniformly dispersed therein, the product of the residual magnetization and the thickness of the magnetic recording layer being not more than 150 Gauss..mu.m.

Magnetic recording medium and device

The present invention relates to a magnetic recording medium for use in an external memory device of an information processing apparatus etc., and an object thereof is to reduce noise, achieve high coercive force, and use the substance as a magnetic recording medium for detecting signals in a magnetoresistance head. In the magnetic recording medium comprising the magnetic recording layer 25 including ferromagnetic grains 22 and a nonmagnetic substance 23, the improvement in structure comprises that the ferromagnetic grains 22 are formed to have respectively an average grain diameter of 50 nm or less and not to be overlapped in the film thickness direction and to be isolated in the direction along a layer surface, and that a product of residual magnetization and a film thickness of the magnetic recording layer 25 is less than or equal to 150 Gauss.cndot..mu.m.

An electrostatic actuator includes a supporting body having a plurality of electrodes are formed at predetermined intervals, and a movable body having a ferroelectrics layer having an area on which polarization charges based on residual dielectric polarization are distributed in a predetermined polarity pattern so as to correspond to the plurality of electrodes of the supporting body. Due to changing, based on switching a pattern of polarities of voltages supplied to the plurality of electrodes, electrostatic attraction and repulsion between the plurality of electrodes of the supporting body and the area of the ferroelectrics layer on which the polarization charges are distributed, the movable body are moved on the supporting body.

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Kawasaki, Japan

Isatake Kaitsu