Sony Corporation

Ichiro Kanagawa

Ryoichi Hiratsuka

Tomoe Ozaki

Kasumi Suzuki

Kazuhiko Suzuki

Hidetoshi Honda

Taketoshi Sato

Miho Abiko

A magnetic recording medium includes a nonmagnetic support having a thickness less than 7 &#x3bc;m and a width of 8 mm; a ferromagnetic metal layer disposed on a surface of the nonmagnetic support; and a reinforcing layer disposed on the other surface of the nonmagnetic support. The magnetic recording medium has a flexural rigidity EI of 5.9&#xd7;10to 1.3&#xd7;10N&#xb7;m (6.0&#xd7;10to 1.3&#xd7;10g&#xb7;cm). The flexural rigidity EI is determined by the following equation:(&#x3c0;/4&#x2212;2/&#x3c0;)&#xb7;/d&#xb7;b&#xd7;9.8&#xd7;10(wherein W is a load that causes an annular test piece having a radius of a cm and a width of b cm which is prepared by cutting a magnetic sheet formed of the magnetic recording medium to undergo a radial displacement d of 0.2&#x3c0;a).

Magnetic recording medium

A method of manufacturing a metallic thin film type magnetic recording medium is provided. The method comprises the steps of arranging an initial substance of said recording medium in opposition to a plasma discharge electrode, said initial substance comprising a non-magnetic support base, a metallic layer capable of functioning as a metallic electrode formed on said non-magnetic support base and a metallic magnetic layer formed on said metallic layer, and forming a protection film on a surface of said initial substance of said recording medium by way of generating plasma discharge while feeding raw material gas between said metallic layer/said metallic magnetic layer and said plasma discharge electrode.

Metallic thin film type magnetic recording medium and method of manufacturing thereof

A magnetic recording medium of a metal thin-film type, which includes a magnetic layer and a carbon protective layer on a non-magnetic support member, and in which a non-magnetic metal thin-film is provided between the magnetic layer and the carbon protective layer, is provided. The magnetic recording medium thus produced can be run stably.

Magnetic recording medium and process for producing same

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Miyagi, Japan

Ichiro Kanagawa