Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1995-03-13
1996-04-16
Epps, Georgia Y.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369110, 369116, G11B 1100
Patent
active
055089828
ABSTRACT:
A method for recording on a magneto-optic recording medium having two magneto-optic recording layers having different Curie temperatures. The magneto-optic layers must be capable of existing in two different magnetic states: a first magnetic state in which both magneto-optic layers are magnetized in the same direction and second state in which the layers are magnetized in opposite directions. The phase, .phi., of the magneto-optic film stack is defined as the arctangent of the magneto-optic ellipticity, .epsilon., divided by the magneto-optic rotation, .theta., i.e.,=tan.sup.- (.epsilon./.theta.) for each magnetic state. The phase difference, .DELTA..phi., for the two states should be about 90.degree.. The method includes initializing the media, performing a first recording pass during which laser power is modulated between a high power record level and a low power record level, and performing a second recording pass during which laser power is modulated between read level power and low record level power.
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Dinh Tan
Epps Georgia Y.
Griswold Gary L.
Kirn Walter N.
Levinson Eric D.
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