Magnetic recording medium having a glass substrate, heat retaini

Details Magnetic recording medium having a glass substrate, heat retaini Magnetic recording medium having a glass substrate, heat retaini

1992-08-18

1994-05-24

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428433, 428660, 428666, 428667, 428680, 428694TS, 428694ST, 428694TP, 428611, 428900, 428928, G11B 500

Patent

active

053147456

ABSTRACT:
A magnetic recording medium comprising a substrate, a ground layer formed over at least one surface of the substrate, and a magnetic layer formed over the ground layer, the ground layer being formed of a material containing at least 95% by weight of Cr. The substrate comprises a base of glass plate, a nonmagnetic metal layer formed over at least one surface of the base, and an amorphous NiP layer formed over the nonmagnetic metal layer. The nonmagnetic metal layer is formed of a material containing at least 95% by weight of Cr, or a material containing at least 95% by weight of Ti or a material containing at least 95% by weight of Cr-Ti alloy. The recording medium has excellent flatness and a high coercive force.

REFERENCES:
patent: 4794047 (1988-12-01), Funamoto
patent: 4990362 (1991-02-01), Kibe et al.
patent: 5037515 (1991-08-01), Tsai et al.
patent: 5084152 (1992-01-01), Lin

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