Magneto optical memory device

Details Magneto optical memory device Magneto optical memory device

1995-03-07

1997-05-20

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694SC, 428694EC, 428694RE, 428694NF, 428694MM, 428900, 369 13, 365122, G11B 566

Patent

active

056310960

ABSTRACT:
A magneto-optical memory device is provided with a base whereon a first magnetic film which exhibits in-plane magnetization at room temperature and exhibits perpendicular magnetization at above room temperature, a second magnetic film having its Curie temperature above room temperature; and a third magnetic film having its Curie temperature set above the Curie temperature of the second magnetic film, which exhibits perpendicular magnetization in a temperature range between room temperature and Curie temperature are laminated in this order. When recording, the temperature of the third magnetic film is raised to the vicinity of its Curie temperature, and information is recorded thereon by an external magnetic field. As the magnetization of the second magnetic film having a temperature rise above its Curie temperature disappears, an exchange coupling force is not exerted between the first magnetic film and the third magnetic film. In the above arrangement, since the effect from the magnetization of the first magnetic film can be avoided, information can be recorded on the third magnetic film by a small external magnetic field, thereby permitting a reduction in electric power consumption and in the size of the apparatus.

REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
M. Kaneko et al., Jpn. J. Appl. Phys., 31, Pt. 1, No. 2B, pp. 568-575 ((1992).

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