Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2004-08-31
2008-09-02
Bernatz, Kevin M (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S829000, C428S830000, C428S836100, C428S831000, C428S831200, C360S135000
Reexamination Certificate
active
07419730
ABSTRACT:
An antiferromagnetically coupled (AFC) magnetic recording medium with an AFC master layer comprising at least two magnetic layers with the top magnetic layer including copper is described. The slave layer is separated from the master layer structure by a nonmagnetic spacer layer selected to antiferromagnetically couple the layers. The master layer structure according to the invention includes a bottom and top layer of distinct ferromagnetic materials. Preferably, the top layer of the master layer is a cobalt alloy including from 1 to 5 at. % copper with an example being CoPt13Cr20B8Cu2. The AFC magnetic layer structure can be used with a variety of substrates including circumferentially textured glass and NiP/AlMg.
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D.D.Djayaprawira, et al., “Dependence of exchange bias field on composition of stabilizing layer and sputtering process in synthetic ferrimagnetic coupled media”, Journal of Magnetism and Magnetic Material, vol. 239, 2002, pp. 396-398.
Bian Xiaoping
Doerner Mary Frances
Kanbe Tetsuya
Mercado Mark
Mirzamaani Mohammad
Bernatz Kevin M
Hitachi Global Storage Technologies - Netherlands B.V.
Knight G. Marlin
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