Over-write capable magnetooptical recording medium having C/N ra

Details Over-write capable magnetooptical recording medium having C/N ra Over-write capable magnetooptical recording medium having C/N ra

1992-09-21

1995-02-14

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

365122, 369 13, 428694ML, 428694MM, 428694LE, 428900, G11B 566

Patent

active

053894553

ABSTRACT:
A medium includes a readout layer, a memory layer, an adjusting layer for an exchange coupling force .sigma..sub.W, and a writing layer, and can perform an over-write operation upon radiation of a modulated laser beam. The readout layer essentially consists of GdFeCo, the memory layer essentially consists of TbFeCo, the adjusting layer essentially consists of GdFeCo, and the writing layer essentially consists of DyFeCo. The C/N ratio of the medium exceeds 53 dB. The C/N ratio is a value obtained when a plurality of mark.sup.H having a period of 1.6 .mu.m are written, and are read out so that medium noise is maximized as compared to other noise components.

REFERENCES:
The Bell System Technical Journal, vol. 62, Sep. 1983, No. 7, Part 1, pp. 1923-1936.

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