Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Naoto Endo

Yuzuru Hosoe

Shinji Fukaya

Kiwamu Tanahashi

Yoshibumi Matsuda

Yotsuo Yahisa

Ichiro Tamai

Tomoo Yamamoto

Akira Ishikawa

Tetsuya Kanbe

Toshinori Ono

Hiroyuki Kataoka

Noriyoshi Goda

Kazuhiro Ura

Akira Kato

Mitsuhiro Shoda

Hiroyuki Suzuki

Naoki Kodama

Tsuneo Suganuma

Katsuo Abe

Tokuho Takagaki

Takao Yonekawa

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

A magnetic recording media formed of magnetic alloy layer of Co as the main component on a substrate through an under-layer, a protective layer and a lubricant layer, stacked in this order, said under-layer comprises plural under-layers including a first under layer of a substantially amorphous and a second under layer of crystalline stacked in this order; and a &#x394; BH[0.01, 50] defined by |BH[0.01%]&#x2212;BH[50%]|, as the difference between a height BH[0.01%] where a Bearing ratio is 0.01% and a height BH[50%] where a Bearing ratio is 50%, is not less than 3 nm and not more than 6 nm, where a Bearing Curve is given by a surface roughness curve of magnetic recording media.

Magnetic recording media and magnetic disk apparatus

A magnetic recording media formed of magnetic alloy layer of Co as the main component on a substrate through an under-layer, a protective layer and a lubricant layer, stacked in this order, said under-layer comprises plural under-layers including a first under layer of a substantially amorphous and a second under layer of crystalline stacked in this order; and a &Dgr;BH&lsqb;0.01, 50&rsqb; defined by &verbar;BH&lsqb;0.01%&rsqb;&minus;BH&lsqb;50%&rsqb;&verbar;, as the difference between a height BH&lsqb;0.01%&rsqb; where a Bearing ratio is 0.01% and a height BH&lsqb;50%&rsqb; where a Bearing ratio is 50%, is not less than 3 nm and not more than 6 nm, where a Bearing Curve is given by a surface roughness curve of magnetic recording media.

A magnetic recording medium for longitudinal recording uses a non-magnetic substrate made of glass ceramics that is suitable for high density recording with low noise. The magnetic recording medium is obtained by forming a magnetic recording film mainly containing cobalt on a non-magnetic glass substrate through a non-magnetic underlaying film made of Cr. Further a non-magnetic covering film is formed thereon. With respect to the crystal orientation of the faces of cobalt measured by X-ray diffraction, the diffraction intensity of the (0002) face is 1.5 times or more and 8 times or less the total diffraction intensities of the other faces.

Magnetic recording medium for longitudinal recording and method of

A magnetic recording medium and magnetic recording apparatus which can provide a high output level and a low noise level are disclosed. A magnetic recording medium includes a multilayer structure of magnetic alloy thin films containing Co, and at least one paramagnetic intermediate region or oxygen-rich region disposed between the magnetic layers. The intermediate region reduces the magnetic interaction between the magnetic layers without the degradation of crystallinity of the magnetic layers. As a result, a magnetic recording medium having such a structure shows low noise performance and a high recording density.

Magnetic recording medium and magnetic recording apparatus

Growing community of inventors

Odawara, Japan

Naoto Endo