Magnetically anisotropic recording medium

Details Magnetically anisotropic recording medium Magnetically anisotropic recording medium

1987-11-16

1989-07-11

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of silicon containing

428611, 428615, 428641, 428668, 428694, 428900, G11B 564

Patent

active

048471615

ABSTRACT:
The disclosure is directed to a magnetically anisotropic recording medium (2) containing a disc-shaped substrate (3) of nonmagnetic material, on the flat side (4) of which is applied a thin lower layer (8) of Si, Ge or Ti, and thereon a Co-containing alloy with vertical magnetic anisotropy. This recording medium is to assure a large signal level without the need for a special magnetically soft substrate. For this purpose, a sandwich-like multilayer structure (7) is provided according to the invention, in which at least three storage layers (10 to 13) of the Co-containing alloy with a respective thickness (d.sub.s) of at most 100 nm are separated by comparatively thinner intermediate layers (15 to 17) of the Si, Ge and/or Ti. The recording medium is advantageously provided for discs of data memories with perpendicular (vertical) magnetization.

REFERENCES:
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patent: 3516076 (1970-06-01), Stein
patent: 3787237 (1974-01-01), Grunberg et al.
patent: 4610935 (1986-09-01), Kumasaka et al.
patent: 4677032 (1987-06-01), Robinson
Japanese Patent Abstracts, vol. 8, No. 13, May 26, 1984.
IEEE Transactions on Magnetics: vol. 14, No. 5, Sep. 1978, pp. 849-851.
vol. 16, No. 1, Jan. 1980, pp. 71-76.
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IEEE Transactions on Magnetics: vol. 18, No. 6, Nov. 1982, pp. 1170-1172.
vol. 19, No. 5, Sep. 1983, pp. 1617-1619.
vol. 20, No. 5, Sep. 1984, pp. 657-662.
vol. 21, No. 5, Sep. 1985, pp. 1426-1428.
vol. 22, No. 5, Sep. 1986, pp. 328-330.

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