Multi-layer over write capable magnetooptical recording medium
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United States of America Patent
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Aug 24, 1993
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app pub date -
Dec 19, 1991
filing date -
Dec 12, 1988
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Abstract
An over write capable multi-layer magnetooptical recording medium comprises a substrate on which is stacked a magnetic layer structure including first and second magnetic layers having perpendicular magnetic anisotropy serving as a recording layer and as a reference layer, respectively. The first layer comprises an alloy composition given by the formula: (Tb.sub.U Dy.sub.100-U).sub.V (Fe.sub.100-W Co.sub.W).sub.100-V wherein U=0 to 60 atomic % V=10 to 30 atomic % W=5 to 40 atomic % and the second layer satisfies the following condition: ##EQU1## wherein .sigma..sub.w : exchange coupling force, M.sub.S2 : saturation magnetization of second layer H.sub.C2 : coercivity of second layer, and t.sub.2 : film thickness of second layers.
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