LONGITUDINAL MAGNETIC RECORDING MEDIUM
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United States of America Patent
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-
N/A
Issued Date -
Oct 23, 2008
app pub date -
Dec 21, 2007
filing date -
Dec 22, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A magnetic recording medium includes as formed on a non-magnetic substrate, a seed layer, an underlayer of a bcc structure-having Cr alloy, an interlayer of an hcp structure-having Ru alloy, a lower recording layer of a Co--Cr--Pt--B base alloy, an upper recording layer having the same alloying base components as those of the lower recording layer, a larger B atom concentration and having a larger Co atom concentration to Cr atom concentration ratio, and a protective layer. The lower recording layer includes a first and a second lower recording layer. When the B atom concentration in the first lower recording layer is B1 and that of the second lower recording layer is B2, then B1
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