Perpendicular magnetic recording medium and manufacturing method

Details Perpendicular magnetic recording medium and manufacturing method Perpendicular magnetic recording medium and manufacturing method

1986-02-26

1988-03-15

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428611, 428668, 428678, 428928, B32B 3200

Patent

active

047313005

ABSTRACT:
A perpendicular magnetic recording medium comprises a recording medium base, a low coercivity layer formed on the recording medium base and having a low coercivity in an in-plane direction thereof, and a high coercivity layer formed on the low coercivity layer and having a high coercivity in a direction perpendicular to a surface of the low coercivity layer. The low coercivity layer and the high coercivity layer are formed from the same magnetic material and constitute a magnetic layer. A method of manufacturing this perpendicular magnetic recording medium comprises a single magnetic layer forming process of successively and continuously forming the low coercivity layer and the high coercivity layer on the recording medium base by using the same magnetic material as a depositing material.

REFERENCES:
patent: 4552820 (1985-11-01), Lin et al.
"Initial Layer Effects in Co-Cr Films", by Edward R. Wuori and Professor J. H. Judy, IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1984, pp. 774-775.
"VSM Profiling of CoCr Films: A New Analytical Technique", by William G. Haines, IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1984, pp. 812-814.
Japanese Laid-Open Patent Application No. 58-169331.

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