Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2011-01-04
2011-01-04
Rickman, Holly (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07862916
ABSTRACT:
The perpendicular magnetic recording medium includes a non-magnetic underlayer composed of Ru or an Ru alloy having a columnar structure in which crystalline particles are isolated from each other by a space, a non-magnetic granular layer provided on the non-magnetic underlayer and composed of crystalline particles and a non-soluble phase and a granular magnetic layer provided on the non-magnetic granular layer and composed of CoCrPt alloy crystalline particles and the non-soluble phase, wherein when a lattice constant in an in-plane direction of the non-magnetic underlayer is a1, the lattice constant in the in-plane direction of the non-magnetic granular layer is a2, and the lattice constant in the in-plane direction of the granular magnetic layer is a3, the relation a1>a2>a3is satisfied.
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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, Sep. 1997, pp. 2983-2985.
S.S.P. Parkin, “Systematic Variation of the Strength and Oscillation Period of Indirect Magnetic Exchange Coupling through the 3d, 4d, and 5d Transition Metals”, vol. 67, No. 25, Physical Review Letters, Dec. 16, 1991, pp. 3598-3601.
Rickman Holly
Showa Denko K.K.
Staas & Halsey , LLP
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