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US 4,539,264 AGranted
Magnetic recording medium
AssigneeSony Corporation
InventorsKenji Yazawa, Kenichi Baba
Life of this patent
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Abstract
A magnetic recording medium having a non-magnetic substrate, a bismuth layer of less than 100 .ANG. thick formed on one major surface of the non-magnetic substrate and a magnetic metal thin film formed on the bismuth layer.
Claims7
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a first layer made of bismuth formed on said substrate, said first layer having a thickness less than 100 .ANG.;
- and
- a ferromagnetic metal layer of Co or Co-Ni alloy formed over said first layer without further physical treatment of said first layer, said magnetic recording medium having isotropic magnetic characteristics on a major surface of said magnetic recording medium.
1 more element
Dependencies are inferred from the claim text.