Magneto-optical recording medium whereon overwriting is permitte

Details Magneto-optical recording medium whereon overwriting is permitte Magneto-optical recording medium whereon overwriting is permitte

1994-06-15

1997-06-03

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694MM, 428694MT, 428694EC, 428694RE, 428694ML, 428694SC, 369 13, G11B 566

Patent

active

056352964

ABSTRACT:
A magneto-optical recording medium includes a first magnetic layer, a second magnetic layer and a third magnetic layer respectively made of rare earth-transition metal alloys. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer has its Curie temperature higher than that of the first magnetic layer, and coercive force thereof at room temperature is nearly zero. The third magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The Curie temperature of the third magnetic layer is higher than the Curie temperature of the first magnetic layer. The coercive force of the third magnetic layer at room temperature is lower than that of the first magnetic layer. The compensation temperature of the third magnetic layer is higher than that of the second magnetic layer. Having the above arrangement, an overwriting is permitted on the magneto-optical recording medium, and an initializing magnetic field and a recording magnetic field in a magneto-optical recording and reproducing device are set in the same direction.

REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
Engl.abstract of Osato/Canon App.No. 63-239637-A, pub. Oct.'88.
Engl.abstract of Osato/Canon App.No. 63-316343-A, pub. Dec.'88.
Engl.abstract of Kaneko/Sony App.No. 2-24801-A, pub Jan.'90.
H. Iida, et al., "Recording Power Characteristics of 130 mm Overwritable MO Disk by Laser Power Modulation Method," in Int. Symp. on Optical Memory, Jap.Journal of Applied Physics, vol. 28, (1989), Supplement 28-3, pp. 367-370.

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