Magnetic recording medium and process for producing the same

Details Magnetic recording medium and process for producing the same Magnetic recording medium and process for producing the same

1987-08-24

1989-06-27

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

2041922, 427131, 427132, 428694, 428900, G11B 564

Patent

active

048429171

ABSTRACT:
A magnetic recording medium having a magnetic film formed on a substrate directly or through an underlayer from an alloy containing Co as a principal component. The central line average surface roughness Ra and maximum surface roughness Rmax of the magnetic film in a direction perpendicular to the direction of magnetic recording are selected so as to fall within the ranges of 1 nm.ltoreq.Ra.ltoreq.20 nm and Rmax.ltoreq.25 Ra, respectively, and the in-plane magnetic anisotropy energy Ku of the magnetic film is selected to fall within the range of 0.ltoreq.Ku.ltoreq.8.times.10.sup.5 erg/cm.sup.3. Thus, it is possible to minimize the value of modulation which represents the degree of variation of read output on the same circumference of a magnetic disk. It is also possible to reduce the noise generated in read and write operations by forming the magnetic film so as have no crystallographic orientation.

REFERENCES:
patent: 3520664 (1970-07-01), York
patent: 4411963 (1983-10-01), Aine
patent: 4567116 (1986-01-01), Sawada et al.
patent: 4642270 (1987-02-01), Morita et al.
patent: 4745005 (1988-05-01), Sugita et al.

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