Magneto-optical recording medium comprising first, second and th

Details Magneto-optical recording medium comprising first, second and th Magneto-optical recording medium comprising first, second and th

1993-08-05

1995-06-27

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 428694ML, G11B 1100

Patent

active

054285852

ABSTRACT:
A magneto-optical recording medium has (1) a first magnetic layer made of a magnetic material which is changed into a vertical magnetization film in response to a temperature rise while is an in-plane magnetization film at a room temperature; (2) a second magnetic layer made of a vertical magnetization film; and (3) a third magnetic layer made of a vertical magnetic film having a higher Curie temperature than that of the second magnetic layer; and (4) a base substrate on which the first, second, and third magnetic layers are luminated in this order. With the arrangement, the optically modulated overwriting can be carried out with respect to the second magnetic layer and it is not necessary to complete the magnetization direction to one direction for each optically modulated overwriting. Moreover, it is possible to reproduce through the first magnetic layer the information which is recorded on a smaller portion than a light beam spot.

REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
Japan Applied Magnetic Society, 15(5):838-844 (1991), pp. 838-845.

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