Fujitsu Corporation

Yoshito Kitamoto

Masahiro Takagi

Yusaku Sakai

Shinji Ohtaki

Yasushi Tamaki

Hikaru Nagai

Kiyoshi Yamaguchi

Akira Kikuchi

Eishin Yamakawa

Makoto Watanabe

Hiroaki Wakamatsu

Katsuhide Sone

Katsumi Kiuchi

Yoshihiro Mitobe

Hiroshi Akiba

Kazuyuki Seki

In a magnetic recording medium wherein a magnetic recording layer for storing information, a carbon type protective layer for preventing damage of the magnetic recording layer and a lubrication layer are sequentially formed on a non-magnetic substrate, the carbon protective layer has a relatively smaller hydrogen content on the side nearer the lubrication layer than on the side nearer the magnetic recording layer. In a magnetic head slider having an electromagnetic conversion device mounted thereto, a carbon protective layer is laminated on at least a sliding surface side, and a lubrication layer is disposed on the carbon type protective layer. In a recording apparatus including a recording medium for storing information and a magnetic head for recording or reproducing information to and from the memory medium, a carbon protective film having a lower hydrogen content at an upper, surface portion thereof than at a lower, initial portion thereof is formed on either the recording medium or a sliding portion of the magnetic head.

Magnetic recording medium and magnetic head having carbon protective

A magnetic recording medium able to cope with low flying height of the magnetic head in a CSS system and having fine surface roughness, wherein (1) a metal layer having columnar protrusions formed by the filming of Ti or the like or (2) a resin layer or glass resin layer having irregularly distributed through-holes are provided on the substrate of a magnetic recording medium to impart roughness (texture).

Magnetic recording medium and magnetic disc device

A method for manufacturing small magnetic disks from a nonmagnetic large disk. A nonmagnetic large disk is first prepared, and subjected to at least one step of a manufacturing process necessary for manufacturing a magnetic disk from a nonmagnetic substrate. The manufacturing process may comprise the steps of applying at least one underlayer to the substrate, applying the layer of magnetic material to the underlayer, applying the protective layer to the layer of magnetic material, applying the lubricating layer to the protective layer, carrying out a texture treatment, polishing the underlayer, and burnishing the protective layer, and carrying out a levitation and characteristic test. After at least one of these steps, the large disk is divided into a plurality of the small disks. Accordingly, it is possible to manufacture small magnetic disks, by the use of manufacturing equipment designed to manufacture large magnetic disks.

Method for manufacturing small magnetic disks from a large disk

A magnetic recording medium having an excellent resistance to wear and CSS strength and showing a satisfactory lubricant retention, and processes for production thereof. The magnetic recording medium includes a substrate having formed thereon, in sequence, a magnetic recording layer, a protective coating, and a lubricant coating, the protective coating including a plane portion and a plurality of fine projections and recesses formed on the plane portion.

Magnetic recording production processes

Magnetic recording medium and production processes thereof

Growing community of inventors

Kawasaki, Japan

Yoshito Kitamoto