Overwriting system for magneto-optical recording with self timin

Details Overwriting system for magneto-optical recording with self timin Overwriting system for magneto-optical recording with self timin

1987-06-24

1991-05-28

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 47, 360 59, G11B 1304, G11B 1112, G11B 1110

Patent

active

050200402

ABSTRACT:
Modulating the intensity of directed energy for thermal writing of memory cells overwrites bits of either state in a storage layer of magnetic material irrespective of the preexisting condition of the cell without employing a magnetic field whose origin is external to the storage layer. Directed energy is synchronized with the medium by superimposing, preferably nonmagnetically, self-timing information on the medium itself and synchronously recovering the self-timing information to assist in directing energy to the medium. The medium itself has a magnetic layer plus recoverable timing information fixed in the medium along a predetermined path preferably embodied in a fixed periodic uniform variation in the nonmagnetic reflection properties along the track.

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Shieh & Kryder, "Magneto-Optic Recording Materials with Direct Overwrite Capability", Appl. Phys. Lett. 49(8), Aug. 25, 1986, pp. 473-474.
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Shieh and Kryder, "Operating Margins for Magneto-Optic Recording Materials with Direct Overwrite Capability", IEEE Transactions on Magnetics, vol. 23, No. 1, pp. 171-173, Jan. 1987.

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