Magnetic recording disk medium having a magnetic layer with unif

Details Magnetic recording disk medium having a magnetic layer with unif Magnetic recording disk medium having a magnetic layer with unif

1995-06-07

1998-01-13

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 654, 428 655, 428332, 428337, 428694SG, 428694T, 428694TR, 428900, G11B 564, G11B 582

Patent

active

057077061

ABSTRACT:
A magnetic recording has very low warp characteristics but excellent film characteristics. Particularly, the recording medium has a high coercivity with a small range of coercivity distribution, with a warp characteristic below 3 .mu.m per radial inch. The medium is formed by heating a substrate at a high temperature with a temperature distribution on the substrate that is improved by the use of a heat distribution mask, which reduces the temperature distribution of the substrate to below .+-.3%.

REFERENCES:
patent: 4859636 (1989-08-01), Aratani et al.
patent: 4987020 (1991-01-01), Bennebar et al.
patent: 5094896 (1992-03-01), Morita et al.
patent: 5133286 (1992-07-01), Choo et al.
patent: 5277960 (1994-01-01), Tsuya et al.
patent: 5480695 (1996-01-01), Tenhover et al.
patent: 5496653 (1996-03-01), Saito et al.

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