Magneto-optic recording medium having two recording layers, and

Details Magneto-optic recording medium having two recording layers, and Magneto-optic recording medium having two recording layers, and

1994-09-02

1995-05-09

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 3692752, G11B 1304

Patent

active

054146780

ABSTRACT:
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.-1 (.epsilon./.theta.) for each magnetic state. The phase difference, .DELTA..phi., for the two states should be about 90.degree.. The invention also includes a magneto-optic drive for use with the medium described above.

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"Refractive indices of reactive magnetooptical thin films," Challener et al., Applied Optics, vol. 29, No. 20, 10 Jul. 1990, pp. 3040-3045.
"Readout Characteristics in Double Storgae Layer Magneto-Optical Disk Memories," IEEE Transactions on Magnetics, vol. Mag-22, No. 5, Sep. 1986, pp. 934-936.
"Multilayered Garnet Films for High Density Magneto-Optic Memory," Itoh et al., IEEE Translation Journal of Magnetics in Japan, vol. TJMJ-2, No. 12, Dec. 1987, pp. 1091-1094.

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