Magneto-optical recording medium and magneto-optical recording a

Details Magneto-optical recording medium and magneto-optical recording a Magneto-optical recording medium and magneto-optical recording a

1994-02-18

1997-03-25

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

056151802

ABSTRACT:
A magneto-optical disk is provided with a recording layer that exhibits perpendicular magnetization, an intermediate layer wherein in-plane magnetization occurs at room temperature and a transition from the in-plane magnetization to perpendicular magnetization occurs as the temperature thereof rises, and an auxiliary layer that is made of a rare-earth-transition-metal alloy and that exhibits perpendicular magnetization, and these layers are laminated in this order. The composition of the rare-earth-transition-metal alloy is set so that the magnetic moment of the rare-earth metal is relatively greater than that of the transition metal at room temperature and the compensation temperature is located between room temperature and the Curie temperature T.sub.c3. A magneto-optical recording apparatus for rewriting information on the magneto-optical disk is provided with a single magnet for applying H.sub.w onto a portion on the magneto-optical disk irradiated by a light beam, as well as for applying H.sub.init having a greater intensity than H.sub.w onto a portion that is apart from the portion irradiated by the light beam. This arrangement makes it possible to achieve a more compact, thinner magneto-optical recording apparatus which allows light-modulation overwriting.

REFERENCES:
patent: 5202862 (1993-04-01), Ohta et al.
patent: 5241520 (1993-08-01), Ohta et al.
patent: 5278810 (1994-01-01), Takahashi et al.
patent: 5428585 (1995-06-01), Hirokane et al.
"Direct Overwrite by Light Power Modulation on Magneto-Optical Multi-Layered Media", Saito, et al. Proc. Int. Symp. on Optical Memory, 1987, Japanese Journal of Applied Physics, vo.. 26 (1987) Suppl 26-4.
"New Direct Overwriting using a Magneto-Optical Trilayer Medium and a Magnet", J. Nakayama, et al, Mecatronics Systems Labs., Sharp Corp., ISOM/OOS 93 Conf. Digest, Jul. 5, 1993.

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