Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-08-02
2011-08-02
Rickman, Holly (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S827000, C428S828000, C428S828100, C428S829000
Reexamination Certificate
active
07989097
ABSTRACT:
According to one embodiment, a magnetic recording medium includes a substrate, a first underlayer formed on the substrate and including an amorphous alloy containing Ni, a crystalline second underlayer formed on the first underlayer and including simple Cr or an alloy containing Cr, and a magnetic recording layer formed on the second underlayer and including at least one element of Fe and Co and at least one element of Pt and Pd, and containing magnetic crystal grains having an L10structure. An oxygen amount remaining on the upper surface of the second underlayer is larger than an oxygen amount remaining on the lower surface of the second underlayer, and a normal line to a (001) plane of the magnetic crystal grains in the magnetic recording layer is oriented with a tilt angle in a range of 3 to 25° to a normal line to a medium plane.
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Kai-Zhong Gao et al., “Magnetic Recording Configuration for Densities Beyond 1 Tb/in2 and Data Rates Beyond 1 Gb/s,” IEEE Transaction on Magnetics, vol. 38 (No. 6), p. 3675-3683, (Nov. 2002).
Chau Linda
Kabushiki Kaisha Toshiba
Pillsbury Winthrop Shaw & Pittman LLP
Rickman Holly
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