Magnetic recording media having CrMo underlayers
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
May 4, 1998
filing date -
May 4, 1998
priority date (Note) -
Expired
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Abstract
A magnetic recording media having a CrMo underlayer provides improved performance characteristics. In one embodiment, the recording media comprises a rigid substrate and an underlayer disposed over the substrate, in which the underlayer comprises CrMo. Preferably, the Mo crystals in the CrMo underlayer are at least about 140 .ANG. in the film growth direction for the 002 crystal plane. Advantageously, recording media with such a 002 crystal size, when used in conjunction with a magnetic layer, such as CoCrTaPtNi, exhibits significantly higher parametric qualities than underlayers using other materials. Typically, Mo in the range between about 7% and 16% in the CrMo alloy, more preferably between about 9% and 11%, will provide the recited 002 crystal size.
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