Magnetic recording medium with an exchange layer structure including a CoCrPtB ferromagnetic layer
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United States of America Patent
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Oct 12, 2004
Grant Date -
Mar 27, 2003
app pub date -
Jun 11, 2002
filing date -
Sep 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic recording medium for high areal recording density that has excellent thermal fluctuation resistance and recording/reproduction characteristics, and a method of producing the same. The magnetic recording medium includes a glass substrate, an NiP layer having an oxide film on its surface provided on the glass substrate, a ground layer provided on the NiP layer, and a nonmagnetic intermediate layer provided on the ground layer. The magnetic recording medium further includes an exchange layer structure composed of a ferromagnetic layer and a nonmagnetic coupling layer provided on the nonmagnetic intermediate layer, and a magnetic recording layer provided on the exchange layer structure. The oxide film on the NiP layer is formed by introducing a small quantity of oxygen into a vacuum chamber of a sputter device. The formation and oxidation of the NiP layer are conducted at a temperature of not less than 140.degree. C.
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