MAGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER

摘要

A magneto-optical recording medium (11) has a second auxiliary magnetic film (4), a first auxiliary magnetic film (5) and a magneto-optical recording film (6) in this order from the laser beam applied side. If the temperatures of the first and second auxiliary magnetic films (4 and 5) exceed their critical temperatures TCR1 and TCR2, the magnetization of the auxiliary magnetic films is changed from the surface magnetization to the vertical magnetization. The Curie points TC0, TC1 and TC2 of the magneto-optical recording film (6), the first auxiliary magnetic film (4) and the second auxiliary magnetic film (5) and the critical temperatures TCR1 and TCR2 satisfy the relations room temperature < TCR2 < TCR1 < TC0, TC1 and TC2. The thickness of the first auxiliary magnetic film (4) is larger than the tickness of a magnetic wall. After the recording magnetic domain (22) of the magneto-optical recording film (6) is contracted and transferred onto the first auxiliary magnetic film (4) by the reproducing light application, it is expanded and transferred onto the second auxiliary magnetic film (5). Since an amplified reproducing signal can be obtained from an expanded magnetic domain (23), the magneto-optical recording medium is suitable for the reproduction of the high density recording.