Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1984-04-12
1986-02-11
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
360131, 360135, 365122, 428694, 428697, 428900, G11B 900
Patent
active
045698813
ABSTRACT:
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 FIG. 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.times.10.sup.-3 to 6.times.10.sup.-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 magnetic optic angle of rotation.
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Freese Robert P.
Gardner Richard N.
Johnson Leslie H.
Rinehart Thomas A.
Atkinson William M.
Lesmes George F.
Little D. B.
Minnesota Mining and Manufacturing Company
Sell D. M.
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