发明名称 |
MEIO DE GRAVACAO OTICO-MAGNETICO E MEIO DE GRAVACAO OTICO-MAGNETICO COM DOIS LADOS |
摘要 |
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 4x10-3 to 6x10-4 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. |
申请公布号 |
BR8402317(A) |
申请公布日期 |
1985.04.02 |
申请号 |
BR19848402317 |
申请日期 |
1984.05.16 |
申请人 |
MINNESSOTA MINING & MFG |
发明人 |
ROBERT P. FREESE;LES H. JOHNSON;THOMAS A. RINEHART;RICHARD N. GARDNER |
分类号 |
G11B5/851;G11B11/10;G11B11/105;G11C13/06;(IPC1-7):G03G5/16 |
主分类号 |
G11B5/851 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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