Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1990-03-13

1992-03-24

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428329, 428336, 428694, 428900, G11B 2300

Patent

active

050987739

ABSTRACT:
A magnetic recording medium having at least two magnetic layers is disclosed, comprising first and second mangetic layers which are successively formed in order on a nonmagnetic support, wherein a coercive force (Hc) of said second magnetic layer is 5.times.10.sup.4 to 1.5.times.10.sup.5 A/m, a ratio (Br/Hc) of a residual magnetic flux density (Br) of said second magnetic layer to the coercive force (Hc) is 2.0.times.10.sup.-6 H/m or more, SFD of said second magnetic layer is 0.6 or less, an average length in the long axis of magnetic particles in said second magnetic layer is 0.25 microns or less, a center line average surface roughness (Ra) of said second magnetic layer is 1/10 or less of the average length in the long axis of the magnetic particles, and a coercive force (Hc') of said first magnetic layer is 2.times.10.sup.4 to 1.times.10.sup.5 A/m.

REFERENCES:
patent: 4506000 (1985-03-01), Kubota et al.
patent: 4959263 (1990-09-01), Aonuma et al.

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