Overwritable, high-density magneto-optical recording medium and

Details Overwritable, high-density magneto-optical recording medium and Overwritable, high-density magneto-optical recording medium and

1993-08-17

1995-09-12

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

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

Patent

active

054495660

ABSTRACT:
A magneto-optical recording medium allowing both direct overwriting by light power modulation and superresolutive reproduction, and a recording/reproduction method therefor are provided. The magneto-optical recording medium includes six magnetic layers of which adjacent layers are coupled by an exchange force thereof, the first magnetic layer being made of a rare earth-transition metal alloy or a ferromagnetic material containing a magnetic transition metal, the second to sixth magnetic layers being each composed of a rare earth-transition metal alloy. Each of the magnetic layers has a predetermined Curie temperature, and the respective transition metal sub-lattice magnetization directions of the first to third magnetic layers (including the magnetization direction of the first layer) are aligned in one direction at room temperature while at the same time those of the fourth to sixth magnetic layers are aligned in one direction at room temperature. In the recording/reproduction method there are applied external magnetic fields of the same direction for recording and for reproduction, respectively.

REFERENCES:
patent: 4882231 (1989-11-01), Aratani
patent: 4908809 (1990-03-01), Tadokoro et al.
patent: 5016232 (1991-05-01), Tadokoro et al.
patent: 5164926 (1992-11-01), Matsumoto
Fujii et al. "Dow and SR Readout by Exchange Coupled Multilayer Film" J. Mag. Soc. Jpn. vol. 17 (1993) pp. 167-170.
Nakada et al. "No Properties of (Pr,Nd)-(Tb,Dy)-FeCo Amorphous Films" IEEE Trans. Mag. vol. 25, No. 5 (Sep. 1989) pp. 3767-3769.
Japanese Journal of Applied Magnetics, 14:12, 1990, pp. 165-170 (English Abstract).
J. Saito et al., "Direct Overwrite by Light Power Modulation on Magneto-Optical Multi-Layered Media", Japanese Journal of Applied Physics, vol. 26, 1987, Supplement 26-4, pp. 155-159.
M. Kaneko et al., "Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution", Japanese Journal of Applied Physics, vol. 31, 1992, Part 1, No. 2B, Feb. 1992, pp. 565-575.

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