Multi-layer amorphous optical recording medium

Details Multi-layer amorphous optical recording medium Multi-layer amorphous optical recording medium

G - Physics

11

B

352/33.3

G11B 5/62 (2006.01) G11B 5/851 (2006.01) G11B 7/24 (2006.01) G11B 11/105 (2006.01)

Patent

CA 1213670

MULTI-LAYER AMORPHOUS MAGNETO OPTICAL RECORDING MEDIUM Abstract of the Disclosure A multi-layer magneto optical thin film recording medium is disclosed having very high carrier-to-noise ratios (at least 47 decibels) and high rotation angles. A transmission electron microscope photomicrograph (at 200,000 X) of one such medium is shown in Figure 1. The magneto optic layer is a multi-phase amorphous material having magnetic anisotropy perpendicular to the plane of the thin film produced in a triode vacuum sputtering process at vacuums in the range of 4 x 10-3 to 6 x 10-4 Torr. Various transparent layers, such as dielectric intermediate and anti-reflective layers and a protective covering layer, are combined with the magneto optic layer and a reflective surface to yield media having enhanced carrier-to-noise ratio and magneto optic angle of rotation.

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