Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1996-09-25

1999-11-09

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

428694ML, G11B 1100

Patent

active

059827130

ABSTRACT:
A magneto-optical recording medium includes first, second, and third magnetic layers laminated in this order. The first magnetic layer, made of a rare earth-transition metal alloy, has a great coercive force at room temperature and is transition metal rich in a temperature range between room temperature and a Curie temperature of the first magnetic layer. The second magnetic layer, made of a rare earth-transition metal alloy, has a Curie temperature higher than that of the first magnetic layer and is rare-earth metal rich at room temperature. The third magnetic layer, made of a rare earth-transition metal alloy, has a Curie temperature higher than that of the first magnetic layer, and a compensation temperature falling in a temperature range between room temperature and the Curie temperature of the third magnetic layer. A magnetization of the third magnetic layer is transferred to the first magnetic layer at a temperature higher than room temperature. A perpendicular magnetic anisotropy Ku3 satisfies 0.3.times.10.sup.6 erg/cc<Ku3<1.0.times.10.sup.6 erg/cc. This arrangement ensures recording by the light modulation overwriting method while achieving the compatibility with other recording/reproducing apparatuses in accordance with the ISO standard, and enables miniaturization of recording/reproducing apparatuses for the magneto-optical recording media.

REFERENCES:
patent: Re35630 (1997-10-01), Saito
patent: 4645722 (1987-02-01), Katayama et al.
patent: 5379275 (1995-01-01), Kaneko
patent: 5498485 (1996-03-01), Nakayama et al.
patent: 5637411 (1997-06-01), Shimazaki et al.
patent: 5645911 (1997-07-01), Matsumoto
patent: 5656384 (1997-08-01), Nishimura et al.
Published Unexamined Japanese Patent Application No. 5-22303, Published Mar. 29, 1993.
Published Unexamined Japanese Patent Application No. 7-161802, Published Jun. 23, 1995.
J. Nakayama, et al. "Direct Overwriting Using Magnetooptical Trilayer and One Magnet", Published Oct. 16, 1993, pp. 5439-5440.

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