Magneto-optical recording media and apparatus

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369 13, 360 59, G11B 700

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active

052087972

ABSTRACT:
In a magneto-optical recording system for recording information with bits having upward magnetization and having downward magnetization on a recording layer of a magneto-optical recording medium, having four magnetic layers exchange-coupled with each other. A laser beam directed onto the medium is modulated to heat the magneto-optical recording medium to two values, for "High" writing and for "Low" writing. During "High" writing, the first to third layers lose magnetization because their Curie temperatures are exceeded, and the direction of the magnetization of the first layer, which is the recording layer is determined mainly by the magnetostatic coupling from the the fourth layer. During "Low" writing, the first and the third layers lose their magnetization as their Curie temperatures are exceeded, and the direction of the magnetization of the first layer is determined by the exchange coupling from the second layer, which in turn is dependent on the exchange coupling from the fourth layer.

REFERENCES:
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4917751 (1990-04-01), Ohta et al.
patent: 5025430 (1991-06-01), Takokoro et al.
patent: 5077120 (1991-12-01), Kato et al.
Recording Power Characteristics of 130 mm Overwritable MO Disk by Laser Power Modulation Method, Matsumoto et al., Oct. 16, 1989.
Magneto-Optic Recording Medium and Apparatus, Aug. 23, 1989.

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