Multi-layer magneto-optical recording medium

Details Multi-layer magneto-optical recording medium Multi-layer magneto-optical recording medium

1981-08-19

1983-11-22

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record medium

360134, G11B 574

Patent

active

044172907

ABSTRACT:
A multi-layer magneto-optical recording medium is constructed by placing a transparent protective film upon a magneto-optical recording medium wherein the easy axis of magnetization is provided perpendicular to the film surface so as to make the direction of magnetization perpendicular thereto to take a binary code depending on whether the vertical direction thereof is upward or downward, and further by placing a metal film, of which melting point is lower than either said magneto-optical recording medium and said transparent protective film, upon said transparent protective film.
The metal film is evaporated by a laser beam irradiated thereon in a manner to leave a portion thereof not evaporated to become a tracking guide, whereby reproducing a magneto-optical record free of disturbance on linear polarization.
The metal film can be perforated to form pits by irradiation of a laser beam. Presence or absence of such pits can be used for storing data and, therefore, is applicable for a read-only memory of optical method or an optical video disc.

REFERENCES:
patent: 3928870 (1975-12-01), Ahrenkiel et al.
patent: 4202932 (1980-05-01), Chen et al.
Lazzari, "Thin-Film Head Study for Perpendicular Recording", IEEE Trans. on Magnetics, vol. Mag-17, No. 6, Nov. 1981.
Manuel, "Vertical Recording Promises New Era", Electronics, Apr. 1982.

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