Magnetic disk

Details Magnetic disk Magnetic disk

1997-02-24

2000-03-28

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428 653, 428 657, 428336, 428457, 428694SG, 428900, 360135, G11B 582

Patent

active

060429275

ABSTRACT:
A magnetic disk yields an excellent off-track characteristics and a high coercive force if a track density is increased. The magnetic disk includes a non-magnetic plate on which data such as a servo signal is formed by convexo-concave patterns and an metallic magnetic film formed on the non-magnetic plate. The metallic magnetic film has a thickness of 50 nm or lower. Between the non-magnetic plate and the metallic magnetic film is formed a primary coat composed of a first and a second coats. The first coat is made of any one of C, Si and Ge and the second coat is made of Cr as a main component. The first coat has a thickness of 2 to 80 nm. The second coat has a thickness of 5 to 108 nm.

REFERENCES:
patent: 4363844 (1982-12-01), Lewis et al.
patent: 5388020 (1995-02-01), Nakamura et al.
patent: 5607740 (1997-03-01), Noda
patent: 5750230 (1998-05-01), Ishikawa et al.

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