Perpendicular magnetic recording medium and fabrication method t

Details Perpendicular magnetic recording medium and fabrication method t Perpendicular magnetic recording medium and fabrication method t

1985-11-01

1988-05-10

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

20419215, 427127, 427128, 427131, 428336, 428457, 428694, 428698, 428701, 428702, 428900, G11B 724

Patent

active

047434910

ABSTRACT:
A perpendicular magnetic recording medium according to this invention comprises an electrically conductive underlayer formed on a non-magnetic substrate, in the case where no high permeability magnetic film is deposited, and a magnetic thin film having a perpendicular magnetic anisotrophy is formed thereon. In the case of a so-called double-layer structure including a high permeablilty magnetic film, on the non-magnetic substrate are formed the high permeablilty magnetic film, an intermediate film, and a magnetic thin film one on another in this order. The nearest neighbor's distance of atoms of the underlayer and the intermediate film is not smaller than 0.25 nm (2.5 .ANG.) and not greater than 0.32 nm (3.2 .ANG.) and they are made of at least one selected from the group consisting of V, Ru, Zn, Os, Rh, Ir, Mo, W, Re, Pd, Pt, Nb, Ta, Sn, Al, Au, Ag, Ti, nitrides and oxides of these elements.

REFERENCES:
patent: 4231816 (1980-11-01), Cuomo et al.
patent: 4271232 (1981-06-01), Heiman et al.
patent: 4673610 (1987-06-01), Shirabata et al.
PTO Translation of J6059537 of 4/5/85.
Derwent Abstract No. 85/009103/02 regarding J59207426 of 12/84.
Derwent Abstract No. 84/240742/39 regarding J59144043 of 8/17/84.
Derwent Abstract #85-76658/13 regarding J60028028 of 2/13/85.
Derwent Abstract #84-240741/39 regarding J59144041 of 8/17/84.
Derwent Abstract #84-162273/26 regarding J5908709 of 5/21/84.

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