Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-01-02
2007-01-02
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S836000
Reexamination Certificate
active
11036064
ABSTRACT:
A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.
REFERENCES:
patent: 4824724 (1989-04-01), Ueda et al.
patent: 5147732 (1992-09-01), Shiroishi et al.
patent: 5478661 (1995-12-01), Murayama et al.
patent: 5480733 (1996-01-01), Okumura et al.
patent: 5482785 (1996-01-01), Mahvan et al.
patent: 5492720 (1996-02-01), Gill et al.
patent: 5510181 (1996-04-01), Nabata
patent: 5587235 (1996-12-01), Suzuki et al.
patent: 5686177 (1997-11-01), Yamanaka et al.
patent: 6001447 (1999-12-01), Tanahashi et al.
patent: 6083599 (2000-07-01), Hirayama et al.
patent: 6310748 (2001-10-01), Yamanaka et al.
patent: 6613428 (2003-09-01), Yamanaka et al.
patent: 6846577 (2005-01-01), Yamanaka et al.
patent: 4-295615 (1992-10-01), None
patent: 6-243455 (1994-09-01), None
patent: 7-65345 (1995-03-01), None
Yogi, T. and Nguyen, T., IEEE Trans. Mag., 29(1), 1993, 307-316.
E. Wohlfarth, “The coefficient of magnetic viscosity”,Journal of Physics F: Metal Physics, vol. 14, 1984, pp. L155-159.
M. El-Hilo et al., “Interaction Effects in Multi-Layer Thin Film Media”,IEEE Transactions on Magnetics, vol. 27, No. 6, Nov. 1991, pp. 5061-5063.
T. Thomson et al., “Activation Volumes of Reversal in Tb-Fe-Co Thin Films”,IEEE Transactions on Magnetics, vol. 28, No. 5, Sep. 1992, pp. 2518-2520.
E. Wohlfarth, “The coefficient of magnetic viscosity”,Journal of Physics F: Metal Physics, vol. 14, 1984, pp. L155-L159.
K. Yamanaka et al., “Magnetic viscosity of oriented barium ferrite media”,Journal of Magnetism and Magnetic Materials, vol. 127, 1993, pp. 233-240.
K. Yamanaka et al., “Time dependence of remanence coercivity and medium noise in obliquely evaporated Co films”,Journal of Magnetism and Magnetic Materials, vol. 145, 1995, pp. 255-260.
K. Yamanaka et al., “Fluctuation fields and medium noise in CoCrTa and CoCrPt films”,Journal of Magnetism and Magnetic Materials, vol. 152 (1996), pp. 411-416.
Furusawa Kenji
Futamoto Masaaki
Hosoe Yuzuru
Inaba Nobuyuki
Matsuda Yoshibumi
Bernatz Kevin M.
Hitachi Global Storage Technologies Japan Ltd.
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