Victor Company of Japan, Limited

Makoto Mizukami

Toshikazu Nishihara

Masanobu Shigeta

Toshiro Abe

Akihiro Kimura

Toshio Kato

Magnetic recording medium

Magnetic recording medium having a glass or amorphous carbon substrate,

A magnetic recording medium includes a primary coat formed on a non-magnetic base and a magnetic film of a CoP alloy formed on the primary coat, wherein the primary coat is a metal simple substance selected from the group of Cr, V and W or an alloy of two or more of them, and the magnetic film is at least one of the CoP alloys represented by the following formulae, wherein X, Y, Z, a and b denote atomic percent (at %):

A magnetic recording medium which comprises a non-magnetic substrate, a Cr undercoat layer formed on the substrate, and a quaternary alloy layer formed on the undercoat layer. The alloy layer consists of the following composition by atomic percent

Magnetic recording medium having a magnetic layer of a quaternary alloy

A magnetic recording medium for high density recording comprising a non-magnetic substrate, a Cr undercoat and a magnetic Ni-Cr-Co alloy thin layer formed on the substrate. The magnetic alloy thin layer has a thickness of from 400 to 1200 angstrom and a Cr content of from 3 to 17 atomic percent. As a result, improved magnetic characteristics and corrosion resistance of the medium are ensured.

Magnetic recording medium comprising a magnetic Co-Ni-Cr alloy thin layer

Magnetic recording media for high density recording having a much improved coercive force comprise a non-magnetic substrate and a magnetic thin film formed on at least one side of the non-magnetic substrate. The magnetic thin film consists essentially of a magnetic material and a tungsten oxide used in an amount of up to about 50 wt %, calculated as W, of the magnetic thin film. A method for making the media is also described.

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Yokosuka, Japan

Makoto Mizukami