Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-03-08
2011-03-08
Ruthkosky, Mark (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S826000
Reexamination Certificate
active
07901801
ABSTRACT:
According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a first magnetic layer and a second magnetic layer formed on the substrate, in which supposing that, for the first and second magnetic layers, respectively, uniaxial magnetic anisotropy constants are Ku1and Ku2, saturation magnetizations are Ms1and Ms2, anisotropic magnetic fields are Hk1and Hk2and the thicknesses are t1and t2, then following conditions are satisfied that Ku1and Ku2are 3×106erg/cc or more, Ms1is smaller than Ms2, Hk1is larger than Hk2and t1is larger than t2.
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Maeda Tomoyuki
Oikawa Soichi
Harris Gary D
Kabushiki Kaisha Toshiba
Pillsbury Winthrop Shaw & Pittman LLP
Ruthkosky Mark
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