Multi-layer over write capable magnetooptical recording medium

U.S. Patent Number: 5239534

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: 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.

Inventors: Matsumoto; Hiroyuki (Tokyo, JP)

Assignee: Nikon Corporation (Tokyo, JP)

Application Number: 07/810,534

Issued: 1993-08-24

Expired: 2005-08-24

Classes: 369/288 ; 360/59; 365/122; 369/13.51; 369/13.53; 428/820.4

Field of search: 369/13,275.1-275.5,288 360/59,114 365/122 428/694

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