MAGNETOOPTICAL RECORDING MEDIUM ALLOWING OVERWRITING WITH TOW OR MORE MAGNETIC LAYERS AND RECORDING METHOD UTILIZING THE SAME

摘要

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.