Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-07-11
2006-07-11
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S830000, C428S828100
Reexamination Certificate
active
07074508
ABSTRACT:
A magnetic recording medium has a base structure, and a synthetic ferrimagnetic structure which is disposed on the base structure and forms a recording layer. The synthetic ferrimagnetic structure includes at least a bottom magnetic layer and a top magnetic layer which are antiferromagnetically coupled via a nonmagnetic spacer layer. The bottom magnetic layer is made of a superparamagnetic layer, and the top magnetic layer is made of a ferromagnetic material. Magnetic moment orientations of the bottom and top magnetic layers are antiparallel at remanent state where an external applied magnetic field is zero. This is achieved since the bottom magnetic layer is in a reverse saturated state due to exchange coupling at remanence, though coercivity is zero for bottom magnetic layer.
REFERENCES:
patent: 6495252 (2002-12-01), Richter et al.
patent: 6602612 (2003-08-01), Abarra et al.
patent: 6645646 (2003-11-01), Umeda et al.
patent: 6689495 (2004-02-01), Sato et al.
patent: 6830824 (2004-12-01), Kikitsu et al.
patent: 1 059 629 (2000-12-01), None
patent: 10-97924 (1998-04-01), None
patent: 2001-056924 (2001-02-01), None
patent: 2002-063714 (2002-02-01), None
patent: WO 98/48413 (1998-10-01), None
Abarra et al., “Longitudinal magnetic recording media with thermal stablilization layers”, Applied Physics Letters, vol. 77, No. 16, pp. 2581-2583, Oct. 16, 2000.
Fullerton et al., “Antiferromagnetically coupled magnetic media layers for thermally stable high-density recording”, Applied Physics Letters, vol. 77, No. 23, pp. 3806-3808, Dec. 4, 2000.
Acharya et al. “Contribution of the magnetic anisotropy of the stabilization layer to the thermal stability of synthetic ferromagnetic media”, Applied Physics Letters, vol. 80, No. 1, pp. 85-87, Jan. 7, 2002.
D.T. Margulies, et al. “Interlayer Coupling and Magnetic Reversal of Antiferromagnetically Coupled Media”, Applied Physics Letters, vol. 80, No. 1, pp. 91-93, Jan. 7, 2002 (XP1092642).
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