Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1994-02-15

1997-09-09

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694ML, 428694SC, 428694MT, 428694RE, 428694MM, 428694EC, 428900, 369 13, 369 14, 360 59, 360114, 360131, 365122, G11B 566

Patent

active

056654677

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 which are laminated in this order. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer made of GdFeCo is set such that its Curie temperature is higher than the Curie temperature of the first magnetic layer, coercive force thereof at room temperature is nearly zero, and that it has an in-plane magnetization at room temperature and a transition occurs therein from the in-plane magnetization to the perpendicular magnetization at above a predetermined temperature. The third magnetic layer is set such that it has a perpendicular magnetization in a temperature range of room temperature and its Curie temperature, its Curie temperature is higher than the Curie temperature of the first magnetic layer, and coercive force thereof at room temperature is smaller than the coercive force of the first magnetic layer.

REFERENCES:
patent: 5278810 (1994-01-01), Takahoshi
"Direct Overwriting Using Magnetooptical Trilayer Medium and One Magnet" (J. Nakayama et al. Jpn. J. Appl. Phys. vol. 32 (1993), Part 1, No. 11B, Nov. 1993, pp. 5439-5440).
"Recording Power Characteristics of 130 mm Overwritable MO Disk by Laser Power Modulation Method" (H. Iida et al. Proc. Int. Symp. on Optical Memory, 1989, Jpn. J. Appl. Phys. vol. 28 (1989) Supplement 28-3, pp. 367-370).

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