Magneto-optical recording medium anti-reflective layers made of

Details Magneto-optical recording medium anti-reflective layers made of Magneto-optical recording medium anti-reflective layers made of

1991-08-01

1992-12-29

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692754, 3692755, 369288, 369286, 428694, G11B 1304, G11B 1112, G11B 1110, G11B 724

Patent

active

051757150

ABSTRACT:
An optical magnetic disk is disclosed having an anti-reflective layer thereon for enhancing the Kerr rotation angle (.theta.k) and the Faraday effect (.theta.f), which comprises a first anti-reflection layer and a second anti-reflective layer coating of an amorphous material forming a thin film layer coating composed of As.sub.40 Se.sub.50-x S.sub.x Ge.sub.10 on the upper and/or the lower surface of a recording layer, selectively, in which x is between 15 to 40, the reflective index (n) is in the range of 2.5 to 2.7, each of the thicknesses of the first and the second anti-reflective layers is between 600-660 .ANG. and 250-350 .ANG., and the Kerr rotation angle (.theta.k) of the amorphous thin film is 1.55.degree. at maximum.

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patent: 4658388 (1987-04-01), Ishiwatari et al.
patent: 4680742 (1987-07-01), Yamada et al.
patent: 4800112 (1989-01-01), Kano et al.

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