Apparatus and system for recording on a magnetooptical recording medium

摘要

The medium (11) is provided with a first magnetic layer (2) and at least a second magnetic layer (3) having a higher Curie point temperature (Tc) and a lower coercive force than those of said first magnetic layer and being exchange coupled with said first magnetic layer is disclosed satisfying a relation:HH > HL > σw2Msh wherein HH is the coercive force of the first magnetic layer; HL is the coercive force of the second magnetic layer; Ms is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and σw is the magnetic wall energy between the first and second magnetic layers. A recording method of such recording medium applies a magnetic field (B1) whilst irradiating the medium with a light beam (15)