Magnetic recording media used in a high-density hard disk drive
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
May 13, 1998
filing date -
May 13, 1998
priority date (Note) -
Expired
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Abstract
The present invention relates to high-coercivity magnetic recording media used in a hard disk drive. The magnetic recording medium comprises a nonmagnetic substrate, a seed layer comprising NiAl alloy sputtered onto the substrate, a sublayer comprising CrV alloy sputtered onto the seed layer, a magnetic layer comprising CoCrPtTaNb alloy sputtered onto the sublayer, and a carbon overcoat sputtered onto the magnetic layer. The magnetic recording medium of such a structure has improved signal-to-noise ratio, coercivity, overwrite capability, and orientation ratio thereby greatly improving the storage density and read/write capacity of the magnetic recording medium. Furthermore, the coercivity of the magnetic layer of CoCrPtTaNb alloy according to the present invention can be as high as 4000 Oersteds even without the use of the NiAl seed layer.
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