Patent ID: 7399539

Claim:
A magneto-optic recording medium having a plurality of tracks arranged at a predetermined track pitch, comprising: a memory layer for accumulating information; a domain wall displacement layer having a domain wall-resistant magnetism smaller than the memory layer; a switching layer having a lower Curie temperature than the memory layer and domain wall displacement layer and provided between the memory layer and domain wall displacement layer; and a recording track region limited to a width direction of each track and provided in a central portion of each track on the domain wall displacement layer, wherein a magnetized state of the memory layer is transferred into only the recording track region; and a buffer region provided between the recording track regions, wherein the buffer region is magnetized in an in-plane direction at a temperature less than a predetermined temperature and vertically magnetized at the predetermined temperature or higher to expand the recording track region, and wherein said predetermined temperature is within normal operating temperatures during reproduction with a reproducing light beam.