Magnetooptical recording medium allowing overwriting with...

Details Magnetooptical recording medium allowing overwriting with... Magnetooptical recording medium allowing overwriting with...

G - Physics

11

B

42/2, 352/31

G11B 7/26 (2006.01)

Patent

CA 1340058

A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than those of said first magnetic layer and being exchange coupled with said first magnetic layer is disclosed. That satisfies a relation: (see fig. I) wherein H H is the coercive force of the first magnetic layer; H L is the coercive force of the second magnetic layer; M S is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and .sigma. w is the magnetic wall energy between the first and second magnetic layers.

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