Method of recording tetra-value signal on magneto-optical record

Details Method of recording tetra-value signal on magneto-optical record Method of recording tetra-value signal on magneto-optical record

1989-12-05

1992-11-10

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

051630311

ABSTRACT:
A method for recording a signal on a magneto-optical recording medium comprising a first magnetic layer exhibiting a vertical magnetic anisotropy and a second magnetic layer exchange-coupled to the first magnetic layer and having a higher Curie point and a lower coercive force at a room temperature than those of the first magnetic layer, exchange forces acting on the first and second magnetic layers being lower than the coercive force of the second magnetic layer by applying to the medium a biasing magnetic field having polarity and magnitude thereof modulated in predetermined states depending on the signal while a light beam having a power to heat the medium to the vicinity of the Curie point of the first magnetic layer is irradiated to the medium.

REFERENCES:
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4805043 (1989-02-01), Doyle
patent: 4938915 (1990-07-01), Saito

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