Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1995-02-10

1997-09-02

Resan, Stevan A.

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428457, 428635, 428668, 428686, 428694MM, 428694ML, 428694EC, 428900, 369 13, 365122, 430945, G11B 1110, G11B 1304

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active

056629885

ABSTRACT:
The magneto-optical recording medium is provided with a readout layer which shows the in-plane magnetization and which changes from the in-plane magnetization to the vertical magnetization when its temperature rises higher than a predetermined temperature by irradiation of the light beam, a memory layer which records information thereon magneto-optically, an intermediate layer which keeps in-plane magnetization from room temperatures to its Curie temperature, and an writing layer which has a Curie temperature higher than that of the memory layer and has coercive force lower than that of the memory layer. Since the intermediate layer becomes a domain wall in optical modulation recording, it prevents the memory layer and the writing layer from forming a domain wall, so information can be recorded in good condition. Moreover, a portion of the readout layer besides a center portion of the light beam shows the in-plane magnetization and masks the memory layer at playback. Therefore, a recording bit can be made small and recording density can be improved without increasing interference of signals from neighboring recording bits, which causes noises.

REFERENCES:
patent: 5258237 (1993-11-01), Nakaki et al.
patent: 5278810 (1994-01-01), Takahashi et al.
patent: 5481508 (1996-01-01), Watanabe et al.
J. Hirokane et al, "Recording characteristics of a magneto-optical super-resolution disk", SPIE, vol. 2338 Optical Data Storage (1994) pp. 301-304.
T. Fukami et al., "Direct Overwrite Technology Using Exchange-Coupled Multilayers (Invited)" (Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. Jpn.,) vol. 15, Supp. No. S1 (1991), pp. 293-298.
M. Ohta et al., "Read out Mechanism of Magnetically Induced Super Resolution" (Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. Jpn.), vol. 15, Supp. No. S1 (1991), pp. 319-322.

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