Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2009-03-12
2010-11-02
Rickman, Holly (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07824785
ABSTRACT:
A perpendicular magnetic recording medium includes a nonmagnetic seed layer, a nonmagnetic intermediate layer provided on the nonmagnetic seed layer, and a perpendicular recording layer provided on the nonmagnetic intermediate layer. The nonmagnetic seed layer includes a first seed layer made of a Ni alloy having a fcc structure, and a second seed layer provided between the first seed layer and the nonmagnetic intermediate layer and made of a Ni alloy having a fcc structure. A content of one or more elements other than Ni within the Ni alloy forming the second seed layer and having a Goldschmidt radius greater than that of Ni is larger than a content of one or more elements other than Ni within the Ni alloy forming the first seed layer and having a Goldschmidt radius greater than that of Ni.
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Toshio Ando, et al., “Triple-Layer Perpendicular Recording Media for High SN Ratio and Signal Stability,” IEEE Transactions on Magnetics, vol. 33, No. 5, pp. 2983-2985, Sep. 1997.
S.S.P. Parkin, “Systematic Variation of the strength and Oscillation Period of Indirect Magnetic Exchange Coupling through the 3d, 4d, and 5dTransition Metals,” Physical Review Letters, vol. 67, No. 25, pp. 3598-3601, Dec. 16, 1991.
Inamura Ryosaku
Toyoda Yuta
Greer Burns & Crain Ltd.
Rickman Holly
Showa Denko K.K.
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