Exchange-coupled direct overwrite magneto-optic recording media

Details Exchange-coupled direct overwrite magneto-optic recording media Exchange-coupled direct overwrite magneto-optic recording media

1994-03-09

1997-06-17

Kiliman, Leszek

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

478694MM, 478694EC, 478694RE, 478900, 369 13, G11B 566

Patent

active

056395671

ABSTRACT:
A magneto-optic recording medium for use with a recording system including a laser beam operable at at least two different energy levels and magnetic field source(s) for generating two different magnetic fields. The medium includes a substrate and at least two layers: a magneto-optical storage layer and a magnetic biasing layer. The storage layer maintains areas of selected magnetic orientation and is made of a rare earth transition metal alloy, such as terbium-iron-cobalt. The magnetic biasing layer is magnetically exchange-coupled to the storage layer and is made of a rare earth transition metal alloy, such as dysprosium-terbium-iron-cobalt. The Curie temperature of the storage layer is greater than that of the bias layer.

REFERENCES:
patent: 4753853 (1988-06-01), Sato et al.
patent: 4878132 (1989-10-01), Aratani et al.
patent: 5132945 (1992-07-01), Osato et al.
patent: 5204193 (1993-04-01), Sato et al.

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