Magneto-optic data storage technique

Details Magneto-optic data storage technique Magneto-optic data storage technique

1984-12-28

1990-01-09

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 700

Patent

active

048932990

ABSTRACT:
An optical data storage medium is disclosed for use in an optical read/write system using an optical read wavelength of W, the medium including a textured region having raised areas and depressed areas disposed in a regular array with a period (pitch) not greater than W and a depth (peak-to-trough) in the range 10 to 1,000 nanometers. The medium comprises a substrate and a regular array of zones of magneto-optic material disposed at least over the peaks and troughs of the surface texture and conforming to the surface texture. In many embodiments, there is also a layer or a regular array of zones of an optically reflective material. In one embodiment, the texture is shallow, being generally in the range 10 to 120 nanometers. In a second embodiment, the depth of the texture is at least one tenth of the value of W. In any of the embodiments, there may be a dielectric layer over the top of the structure. The texture can take the form of a grating, or of crossed gratings, or be defined between an array of protuberances; structures with sinusoidal, square-wave (top-hat) or saw-tooth profile are advantageous.

REFERENCES:
patent: 4359750 (1982-11-01), Howe
patent: 4489139 (1984-12-01), Ohta et al.
patent: 4516234 (1985-05-01), Nakagawa et al.
patent: 4543301 (1985-09-01), Yazawa et al.

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