Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2005-07-01
2009-02-24
Bernatz, Kevin M (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C427S131000
Reexamination Certificate
active
07494726
ABSTRACT:
A perpendicular medium is disclosed in which an isolation structure of an underlayer is formed using a simple method as in a conventional manufacturing process for a medium of continuous films. The method suppresses dispersion of alignment and reduced magnetic cluster size in a magnetic recording layer. The perpendicular medium exhibits high recording density owing to thin film thickness of the underlayer. A perpendicular magnetic recording medium includes at least an underlayer and a magnetic recording layer sequentially laminated on a nonmagnetic substrate. The underlayer consists of crystal grains and an amorphous grain boundary, and the crystal grain has a shape holding a relation (an area of a bottom region at an initial stage of growth)>(an area of a top region).
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Chinese Office Action, mailed Apr. 4, 2008, issued in counterpart application CN 2005100844788.
Sakai Yasushi
Watanabe Sadayuki
Bernatz Kevin M
Fuji Electric Device Technology Co. Ltd.
Rossi Kimms & McDowell LLP
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