Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1994-07-21

1996-05-21

Kiliman, Leszek

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428323, 428329, 428336, 428694B, 428694BA, 428694BH, 428694BM, 428694BS, 428900, G11B 566, B32B 702, B32B 516

Patent

active

055188044

ABSTRACT:
In a magnetic recording medium comprising a nonmagnetic substrate, a first magnetic layer, and a second magnetic layer mounted in this order, the first magnetic layer has a greater coercive force and a lower residual flux density than the second magnetic layer. When the second magnetic layer is directly mounted on the first magnetic layer, the second magnetic layer has a thickness within the range of 0.05-0.5 .mu.m and a coercive force within the range of 1200-2000 Oe while the first magnetic layer has a coercive force greater than that of the second magnetic layer by 800-2500 Oe and a residual flux density in the range of 30-70% of that of the second magnetic layer. When a nonmagnetic layer is held between the first and second magnetic layers, the first magnetic layer has a coercive force not smaller than 2000 Oe and a residual flux density not greater than 70% of that of the second magnetic layer while the second magnetic layer has a coercive force not smaller than 1200 Oe, a residual flux density not lower than 1600 G, and a thickness not greater than 0.5 .mu.m.

REFERENCES:
patent: 4442159 (1984-04-01), Dezawa et al.
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 4643941 (1987-02-01), Miyoshi et al.
patent: 4977040 (1990-12-01), Yano et al.
patent: 5156908 (1992-10-01), Araki et al.

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