Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-08-23
2011-08-23
Rickman, Holly (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
08003237
ABSTRACT:
A magnetic disk10for use in perpendicular magnetic recording, which includes an underlayer18, a size-reduction promoting layer20(nonmagnetic granular layer) of a granular structure, and a magnetic recording layer22having a ferromagnetic layer32of a granular structure. The size-reduction promoting layer20has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer18and the ferromagnetic layer32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer32.
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Japanese Office Action corresponding to Japanese Patent Application No. 2005-086220, dated Mar. 2, 2010.
Kim Kong
Sonobe Yoshiaki
Uemura Masaki
Umezawa Teiichiro
Rickman Holly
WD Media, Inc.
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