Magneto-optical recording medium whereon recording is carried ou

Details Magneto-optical recording medium whereon recording is carried ou Magneto-optical recording medium whereon recording is carried ou

1992-07-07

1994-01-11

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, G11B 1100

Patent

active

052788105

ABSTRACT:
A magneto-optical recording medium is consisted of a recording layer, a readout layer and a writing layer. The readout layer is made of rare earth-transition metal alloys wherein an easy magnetization axis is parallel to the recording layer at room temperature, and the easy magnetization axis is perpendicular to the recording layer as the temperature of the readout layer is raised above a predetermined temperature by irradiating thereon with a light beam. The writing layer is made of rare earth-transition metal alloys having such coercive force that a magnetization direction thereof is switched by an external magnetic field at room temperature and Curie temperature that is above Curie temperature of the recording layer. With the above arrangement, an overwriting function can be achieved by adjusting a light intensity of the light beam so that the temperature falls within the range between the Curie temperature of the writing layer and the Curie temperature of the recording layer, or above the Curie temperature of the writing layer.

REFERENCES:
patent: 5016232 (1991-05-01), Tadokoro et al.
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5051970 (1991-09-01), Ishii et al.
patent: 5132945 (1992-07-01), Osato et al.
patent: 5153868 (1992-10-01), Fujinaga
Ohta et al., "Read Out Mechanism of Magnetically Induced Super Resolution" J. Magn. Soc. Jpn., vol. 15, Supplement No. S1 (1991), pp. 319-322.

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