Magnetic recording medium
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United States of America Patent
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Apr 7, 1998
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N/A
app pub date -
Dec 5, 1995
filing date -
Dec 5, 1994
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Abstract
A magnetic recording medium comprising: a non-magnetic substrate; a Co-based alloy magnetic layer (ML); and a non-magnetic Cr-based underlayer position between said magnetic layer and said substrate, compatibly provided with a high S/N and a high coercive force, and an intermediate layer (IL), formed of a Co-based alloy having the hcp structure, which is positioned between the magnetic layer and the non-magnetic underlayer, said intermediate layer having a ratio R=(BsIL*IL)/(BsML*ML), which is the product (BsIL*IL) of the saturation magnetic flux density (BsIL) of the Co-based alloy which constitutes said intermediate layer and the thickness (tIL) of the intermediate layer film to the product (BsML*ML) of the saturation magnetic flux density (BsML) of the Co-based alloy which constitutes said magnetic layer and the magnetic layer film thickness (tML) at 0.2 or less.
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