Claims
- 1. A magnetic recording medium which comprises: a first magnetic layer containing magnetite, a cobalt doped .gamma.-Fe.sub.2 O.sub.3 ; .gamma.-Fe.sub.2 O.sub.3 or a cobalt doped magnetite, which is coated on a non-magnetic substrate and a second magnetic layer containing a cobalt doped .gamma.-Fe.sub.2 O.sub.3, which is coated on said first magnetic layer, wherein said first magnetic layer has a thickness of 3.0 to 6.0 microns and a coercive force of 400-560 Oe, and wherein said second magnetic layer has a thickness of 1.5 to 3.0 microns and a coercive force of 590 to 800 Oe, and wherein the residual magnetic flux density is greater than y, wherein
- Y=1.60X+556 (gauss)
- and X represents the coercive force of the first magnetic layer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-13934 |
Feb 1979 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 119,209, filed Feb. 7, 1980 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4075384 |
Suzuki et al. |
Feb 1978 |
|
4265931 |
Tamai et al. |
May 1981 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
119209 |
Feb 1980 |
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