Magneto-optical recording medium and method

Details Magneto-optical recording medium and method Magneto-optical recording medium and method

1991-05-20

1998-09-29

Kiliman, Leszek

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428336, 428694ML, 428694SC, 428694LE, 428694MT, 428694RE, 428694MM, 428694EC, 428 61J, 428660, 428668, 428670, 428678, 428679, 428691, 428900, 360131, 369 13, 369288, 365122, G11B 566

Patent

active

058144005

ABSTRACT:
A magneto-optical recording medium comprises in combination: a magneto-optical recording layer capable of writing or erasing information by a laser beam and an external magnetic field and of reading the information by a Kerr effect; and a substrate having the magneto-optical recording layer formed thereon. The magneto-optical recording layer has at least two layers, including a first magneto-optical recording layer and a second magneto-optical recording layer which are magnetically coupled together. The first magneto-optical recording layer is a layer providing a greater magneto-optical effect in a short light wavelength range than the second magneto-optical recording layer though that having less perpendicular magnetic energy than this, as is provided on an irradiation side of the laser beam. It provides advantages in both the magneto-optical effect and perpendicular anisotropy in consideration of the thicknesses or compositions of the first and second magneto-optical recording layers.

REFERENCES:
patent: 4789606 (1988-12-01), Yamada et al.
patent: 4992336 (1991-02-01), Yamamoto et al.
patent: 5082749 (1992-01-01), Carciq

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