Appeal No. 96-1078
Application No. 07/960,887
material that contains chiefly iron (Fe), and that has a
saturation magnetic flux density of at least 19kG for
recording a perpendicular magnetic recording medium. The
perpendicular magnetic recording medium has a perpendicular
magnetic film that contains CoPt, and that has a vertical
coercive force of at least 1,500 Oe.
Claim 1 is the only independent claim on appeal, and it
reads as follows:
1. A perpendicular magnetic recording apparatus for
recording a perpendicular magnetic recording medium having a
perpendicular magnetic film which contains CoPt and which has
a vertical coercive force of at least 1500 Oe, by use of a
record head having a magnetic gap portion being formed of a
soft magnetic thin film that has a saturation magnetic flux
density 4BMs of at least 19kG and chiefly contains Fe.
The references relied on by the examiner are:
Watanabe et al. (Watanabe) 4,745,510 May 17,
1988
Kobayashi et al.(Kobayashi) 4,858,049 Aug. 15,
1989 Otomo et al. (Otomo) 4,894,098 Jan.
16, 1990
Shiroishi et al. (Shiroishi) 5,147,732
Sept. 15, 1992
Hayashi et al. (Hayashi), "CoPtB(O) alloy films as new
perpendicular recording media," Journal of Applied Physics,
Vol. 67, No. 9, May 1, 1990, pages, 5175 through 5177.
Hayashi et al. (Hayashi), "Magnetic Properties and
Microstructure of Co-Pt-B-O Alloy Films," Materials Research
Society Symposium Proceedings, Vol. 232, pages 35 through 46.
2
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