Magnetic recording medium
AssigneeSony Corporation
InventorKenji Yazawa
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Abstract
A magnetic recording medium is disclosed which includes a non-magnetic substrate, a first layer made of bismuth formed on the substrate in a discontinuous island shape, and a ferromagnetic metal layer formed over the first layer and the substrates and also a magnetic recording medium is disclosed which includes a non-magnetic substrate, a first layer formed continuously covering the substrate made of amorphous silicon and/or silicon compound, a second layer made of bismuth formed on the substrate in a discontinuous island shape and a ferromagnetic metal layer formed over the first and second layers.
Claims6
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a first layer made of bismuth having a thickness of from 10 to 1000 Angstroms formed on said substrate in a discontinuous island shape;
- and
- a ferromagnetic metal layer having a thickness of from 100 to 1000 Angstroms formed over said first layer and said substrate, said medium having isotropic magnetic characteristics in the plane of the ferromagnetic metal layer.
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a first layer formed continuously covering said substrate made of amorphous silicon and/or silicon compound having a thickness of from 50 to 500 Angstroms;
- a second layer having a thickness of from 100 to 1000 Angstroms made of bismuth formed on said first layer in a discontinuous island shape;
- and
- a ferromagnetic metal layer having a thickness of from 100 to 1000 Angstroms formed over said second layer, said medium having isotropic magnetic characteristics in the plane of the ferromagnetic metal layer.
A magnetic recording medium comprising:
- a non-magnetic substrate,
- a first layer composed of bismuth in a discontinuous island shape having a thickness between 10 .ANG. and 1000 .ANG. on said non-magnetic substrate, and
- a ferromagnetic layer having a thickness of from 100 to 1000 Angstroms formed over said first layer by vapor deposition of ferromagnetic metal in a direction normal to a surface of said substrate, said recording medium having isotropic magnetic characteristics in the plane of the ferromagnetic layer.
Dependencies are inferred from the claim text.