Method of producing a perpendicular magnetic disc
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United States of America Patent
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Jun 4, 2013
Grant Date -
Mar 22, 2012
app pub date -
Mar 24, 2011
filing date -
Mar 31, 2010
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Abstract
A method for manufacturing a perpendicular magnetic disk 100 that includes a step of forming, on a base 110, a granular magnetic layer 160 in which a grain boundary portion is formed by segregation of a non-magnetic substance containing an oxide as a main component around magnetic particles containing a CoCrPt alloy grown in a columnar shape as a main component. The method also includes a step of forming an auxiliary recording layer 180 that contains a CoCrPtRu alloy as a main component and has a film thickness of 1.5 to 4 nm above the granular magnetic layer, and a step of heating the base formed with the auxiliary recording layer in a temperature range of 210 to 250° C.
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