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US 4,543,301 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 on which a first bismuth Bi under layer, a first magnetic metal layer, a compound layer made of the magnetic metal, a second bismuth Bi under layer and a second magnetic metal layer are sequentially formed in this order.
Claims8
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a first bismuth under layer formed on said non-magnetic substrate;
- a first magnetic metal layer formed on said first bismuth under layer;
- a compound layer composed of a compound of the metal of said first magnetic layer formed on a surface portion of said magnetic metal layer;
- a second bismuth under layer formed on said compound layer;
- and
- a second magnetic metal layer formed on said second bismuth under layer.
4 more elements
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a first bismuth under layer formed on said non-magnetic substrate;
- a first magnetic metal layer formed on said bismuth under layer by vapor deposition in which the angle of incidence of a vapor of said magnetic metal is substantially normal to a surface of said substrate;
- a compound layer composed of a compound of the metal of said first magnetic metal formed on a surface portion of said magnetic metal layer;
- a second bismuth under layer formed on said compound layer;
- and
- a second magnetic metal layer formed on said second bismuth under layer by vapor deposition in which the angle of incidence of a vapor of said magnetic metal is substantially normal to the surface of said substrate.
4 more elements
Dependencies are inferred from the claim text.