Magneto-optical recording medium having a plurality of magnetic

Details Magneto-optical recording medium having a plurality of magnetic Magneto-optical recording medium having a plurality of magnetic

1997-01-07

1998-10-13

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

428694RE, 428694EC, G11B 1100

Patent

active

058222820

ABSTRACT:
A magneto-optical recording medium has at least a substrate, a first magnetic layer, a second magnetic layer, and a first interface layer provided between the first and second magnetic layers. The first magnetic layer exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature thereof. The second magnetic layer has a coercive force lower than A: that of the first magnetic layer at room temperature, has a Curie temperature higher than that of the first magnetic layer, and exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature of the second magnetic layer. The first interface layer is made of at least one rare-earth metal and has a thickness of several atoms. With this arrangement, it is possible (1) to carry out light modulation overwriting with respect to the magneto-optical recording medium, (2) to carry out initialization without an initializing magnetic field, and (3) to stabilize recording bits.

REFERENCES:
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5554436 (1996-09-01), Katayama et al.
patent: 5623458 (1997-04-01), Matsumoto et al.
patent: 5631096 (1997-05-01), Nakajima et al.
Nakayama, J., et al., "Magneto-Optical Recording Medium", Japanese Laid-Open Patent Publication No. Tokukaihei 6-251443, Laid Open on Sep. 9, 1994.
Japanese Laid-Open Patent Publication No. Tokukohei 5-22303, Laid Open on Mar. 29, 1993.
M. Kaneko, et al. "The Interface Wall Structure of Magnetic Triple-Layer Film for Overwriting by Light Intensity Modulation", Proc. Int. Symp. on Optical Memory, Japanese Journal of Applied Physics, vol. 28, Aug. 31, 1989, pp. 27-31.

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