| 摘要 |
<p>A magnetooptical recording medium comprises a transparent substrate, a first magnetic layer laid on the substrate, which has in-plane magnetization at room temperature and vertical magnetization at an elevated temperature, a second magnetic layer for storing information, which is laid on the first magnetic layer and which has vertical magnetization between the room temperature and a Curie temperature thereof, and a third magnetic layer disposed between the first magnetic layer and the second magnetic layer and made of a magnetic phase transition material undergoing reversible transition from antiferromagnetism to ferromagnetism, wherein an antiferromagnetism-ferromagnetism phase transition temperature of the third magnetic layer is near a temperature at which the first magnetic layer changes from in-plane magnetization to vertical magnetization. An information recording method for reproducing information from the magnetooptical recording medium comprises a step of forming a light spot as irradiating laser light through the substrate to the first magnetic layer, a step of causing a temperature distribution caused by irradiation of the laser light to define, in the light spot, a first region in which magnetization of the first magnetic layer is oriented mainly longitudinally and in which magnetic domain information in the second magnetic layer is masked against reading by the magnetooptical effect, and a second region in which the first magnetic layer changes into vertical magnetization and in which the magnetic domain information recorded in the second magnetic layer is transferred to the first magnetic layer, and a step of reproducing the magnetic domain information in the second region by the magnetooptical effect, utilizing reflected light of the laser light. <MATH> <MATH></p> |
