Magneto-optical multilayer recording disk and method of reproduc

Details Magneto-optical multilayer recording disk and method of reproduc Magneto-optical multilayer recording disk and method of reproduc

1991-02-25

1993-02-16

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 369288, G11B 724

Patent

active

051877031

ABSTRACT:
A magneto-optical disk is provided with a transparent substrate of a disk shape, and a multiple layered structure which is formed on the substrate and includes a plurality of transparent dielectric films and magnetic recording films which are alternatively layered. One method of reproducing the magneto-optical disk is enabled, which has the steps of inputting a circularly or elliptically polarized light on the magneto-optical disk, and detecting an intensity change of the light caused by the magneto-optical disk due to the circular dichroism effect thereof, as a reproduced signal. Another method of reproducing the magneto-optical disk is also enabled, which has the steps of inputting a linearly polarized light on the magneto-optical disk, and detecting a rotation change of a polarization plane of the light caused by the magneto-optical disk due to the magnetic Kerr effect, as a reproduced signal.

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patent: 5058099 (1991-10-01), Murakami et al.
patent: 5063092 (1991-11-01), Hirota et al.
Y. Murakami et al., "A Magneto-Optical Disk for Readout Using Circular Dichroism Effect", IEEE Trans. Journal on Magnetics in Japan vol. 5, No. 4, Apr. 1990.
"A Magneto-Optical Disk for Readout Using Circular Dichroism Effect", Japanese Applied Magnetic Association, vol. 13, No. 2, 1989 pp. 195-198.

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