Magneto-optical recording medium and magneto-optical recording m

Details Magneto-optical recording medium and magneto-optical recording m Magneto-optical recording medium and magneto-optical recording m

1997-10-24

1999-03-30

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

428694MM, G11B 1100

Patent

active

058897402

ABSTRACT:
Featured is a magneto-optical recording medium including a first magnetic layer, a second magnetic layer, a third magnetic layer and a fourth magnetic layer formed one on another in this order. The first, second, third and fourth magnetic layers have Curie points Tc1, Tc2, Tc3 and Tc4, respectively, which satisfy the condition of Tc3<Tc1<Tc2<Tc4, and exhibit a perpendicular magnetic anisotropy in a temperature range between room temperature and their respective Curie points. The first magnetic layer is adapted to be copied with the magnetization state of the second magnetic layer at a temperature higher than a first temperature, but not copied at a temperature not higher than the first temperature. The first temperature is defined as a temperature between room temperature and the Curie point Tc1. The third magnetic layer is adapted to be copied with the magnetization state of the fourth magnetic layer at least at room temperature. The second magnetic layer is adapted to be copied with the magnetization state of the third magnetic layer at least at room temperature and to be influenced by a magnetic field from the fourth magnetic layer so as to have a magnetization direction determined by the magnetic field at a temperature higher than the Curie point Tc1.

REFERENCES:
patent: 5208797 (1993-05-01), Nakaki et al.
patent: 5623458 (1997-04-01), Matsumoto et al.
patent: 5787056 (1998-07-01), Nakayama et al.
T. Tokunaga, et al., J. Magn. Soc. Japan, vol. 17, Supplement No. S1 (1993), Exchange-Coupled Quadrilayer Films for Direct Overwrite MO Disks, pp. 357-362 (no month available).

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