Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2004-04-07
2008-12-30
Bernatz, Kevin M (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S836200, C360S131000, C427S127000, C427S255190, C427S255290
Reexamination Certificate
active
07470474
ABSTRACT:
A magnetic recording medium which is provided on a nonmagnetic substrate1with at least an orientation-controlling layer3for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer4having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate1, and a protective layer5and characterized in that the perpendicularly magnetic layer4includes two or more magnetic layers, that at least one of the magnetic layers is a layer4ahaving Co as a main component and containing Pt as well and containing an oxide and that at least another of the magnetic layers is a layer4bhaving Co as a main component and containing Cr as well and containing no oxide.
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Iwasaki Takeshi
Kobayashi Kazuo
Maeda Tomoyuki
Nakamura Futoshi
Oikawa Soichi
Bernatz Kevin M
Kabushiki Kaisha Toshiba
Sughrue & Mion, PLLC
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