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Abstract

In a magnetooptical computer disk having one or more optically transparent dimensionally stable substrates and one or more double layer systems consisting of two exchange-coupled magnetic layers which consist of alloys of rare earth metals with transition metals and have vertical magnetic anisotropy, the first magnetic layer adjacent to the substrate has a composition corresponding to the formula I RE.sub.x TM.sub.100-x-y-a Pt.sub.y A.sub.a I and the second magnetic layer, which is arranged on that side of the first magnetic layer which faces away from the substrate, has a composition corresponding to the formula II RE.sub.u TM.sub.100-u-b B.sub.b II where RE is one or more elements from the group consisting of Gd, Tb, Dy and Ho, TM is one or more elements from the group consisting of Fe and Co, A and B independently of one another are elements from the group consisting of Cr, Nb, Ta, Al, Si, Ni and Mo, and 5.ltoreq.x.ltoreq.30, 0.5.ltoreq.y.ltoreq.20, 15.ltoreq.u.ltoreq.30, 0.ltoreq.a.ltoreq.25 and 0.5.ltoreq.b.ltoreq.25.

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