Magneto-optical recording medium permitting an initializing magn

Details Magneto-optical recording medium permitting an initializing magn Magneto-optical recording medium permitting an initializing magn

1996-05-23

1997-09-09

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 428694ML, G11B 1100

Patent

active

056663323

ABSTRACT:
A magneto-optical recording medium with a first, second, and third magnetic layers which are laminated on a substrate. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer has an in-plane magnetization at room temperature, and has a perpendicular magnetization at or above a temperature falling within a range between room temperature and its Curie temperature. The third magnetic layer has an in-plane magnetization at room temperature, and has a perpendicular magnetization at or above a temperature falling within a range between room temperature and the temperature at which a transition occurs in the second magnetic layer from the in-plane magnetization to the perpendicular magnetization. Accordingly, since the second and third magnetic layers have the in-plane magnetization at room temperature, it is possible to previously direct the magnetization of the third magnetic layer in a single specific direction by the induction of an initializing magnetic field during a rise in temperature caused by a laser beam projection. Therefore, the initializing magnetic field can be set smaller than a recording magnetic field. As a result, it is possible to reduce the size of a recording device.

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