Magnetic recording medium and method for producing the same

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

1993-09-09

1996-09-10

Thibodeau, Paul

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428649T, 428694TS, 428694SL, 428900, G11B 566, G11B 570

Patent

active

055544401

ABSTRACT:
A magnetic tape having a polymer substrate and a magnetic layer which is formed directly on a surface of the substrate or on a primer layer formed on the substrate and contains cobalt, oxygen and optionally nickel, in which a coercive force is at least 120 kA/m and a squareness ratio is at least 0.9 in a hysteresis loop which is obtained when a magnetic field is applied in a plane of the magnetic layer in a longitudinal direction of the magnetic tape, and on the hysteresis loop, an intensity of the applied magnetic field, at which a magnetization when the applied magnetic field is increased is 99% of the magnetization when the applied magnetic field is decreased, is not larger than 400 kA/m, and preferably, a ratio of a value of magnetization at an intersection between a tangential line drawn at a point which gives a residual magnetization at the applied magnetic field of 0 (zero) and a tangential line drawn at a point which gives a coercive force with a magnetization of 0 in a second quadrant to said residual magnetization is at least 0.9, which magnetic tape has improved high density recording/reproducing properties.

REFERENCES:
patent: 4550062 (1985-10-01), Takayama et al.
patent: 4594296 (1986-06-01), Noguchi et al.
patent: 4652460 (1987-03-01), Shirahata et al.
patent: 5225234 (1993-07-01), Takai et al.
patent: 5244751 (1993-09-01), Takayama et al.
Chiba et al., IEEE Transactions on Consumer Electronics, 35(3), 421-427 (1989).
Feuerstein et al., Metal Finishing, 83(9), 47-52 (1985).
National Technical Report, 25(5) 1058-1069 (1979).

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