PERPENDICULAR MAGNETIC RECORDING MEDIUM
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United States of America Patent
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Issued Date -
Apr 28, 2011
app pub date -
Mar 30, 2009
filing date -
Mar 31, 2008
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Abstract
An object of the present invention is to provide a perpendicular magnetic recording medium capable of reducing noise in an electromagnetic transducing characteristic in a configuration including a magnetic recording layer of a granular structure containing Co and an auxiliary recording layer. The perpendicular magnetic recording medium of the present invention includes: on a non-magnetic substrate, a first magnetic recording layer 20a of a granular structure in which a non-magnetic grain boundary part is provided between magnetic grains in a columnar shape containing at least Co; a non-magnetic layer 22 provided on the first magnetic recording layer 20a; a second magnetic recording layer 20b of a granular structure in which a non-magnetic grain boundary part is provided between magnetic grains in a columnar shape containing Co provided on the non-magnetic layer 22; and an auxiliary recording layer 24 provided on the second magnetic recording layer 20b.
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