Magneto-optical memory element

Details Magneto-optical memory element Magneto-optical memory element

1989-08-09

1991-10-15

Shoop, Jr., William M.

Dynamic information storage or retrieval

Storage medium structure

Specified material

360131, 369283, 428694, G11B 724

Patent

active

050580990

ABSTRACT:
A magneto-optical memory element has a multi-layer construction in the order from a side first receiving light from a light-source which includes a first transparent dielectric film, a rare earth transition metal alloy film, a second transparent dielectric film and a reflective film. The magneto-optical device uses circular dichroism effect of a magnetic mater for reading information. The rare earth transition metal alloy film has a refractive index represented by n.+-..DELTA.n wherein n=3.2-3.55i and .DELTA.n=0.05-0.03i. The thickness of film is about 18 to 46 nm. The second transparent dielectric film has a refractive index of 2.0.+-.0.2 and a film thickness of 80 to 108 nm.

REFERENCES:
patent: 4639816 (1987-01-01), Tomita
patent: 4740447 (1988-04-01), Itoh
patent: 4833043 (1989-05-01), Gardner
patent: 4837130 (1989-06-01), Ohta et al.

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