PERPENDICULAR MAGNETIC RECORDING DISK AND METHOD OF MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
May 7, 2009
app pub date -
Mar 31, 2007
filing date -
Mar 31, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide a perpendicular magnetic recording disk having a film structure that improves overwrite characteristics (O/W) while maintaining a coercive force (Hc) high enough not to affect heat fluctuation resistance, and a manufacturing method thereof.A magnetic disk for use in perpendicular magnetic recording, having at least an underlayer, a first magnetic recording layer, and a second magnetic recording layer on a substrate in the order named, characterized in that the first magnetic recording layer and the second magnetic recording layer are each a ferromagnetic layer of a granular structure containing a nonmagnetic substance forming grain boundary portions between crystal grains containing at least Co (cobalt) and, given that the content of the nonmagnetic substance in the first magnetic recording layer is A mol % and the content of the nonmagnetic substance in the second magnetic recording layer is B mol %, A
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