Patent ID: 6124048
Filing Date: 2000-09-26
Classification: G11B,Y10S

Abstract:
A magneto-optical storage medium for the repeated writing of information at a write temperature T.sub.w, or at two write temperatures T.sub.h, T.sub.l, above room temperature T.sub.a and for the repeated reading out at a temperature T.sub.m, with a front mask at the temperature T.sub.f and a rear mask at a temperature T.sub.r, above the room temperature T.sub.a, in an external magnetic field H.sub.e, which medium includes a substrate, a first magnetic layer which is disposed on the substrate and has a temperature-dependent coercivity H.sub.C1 (T), a compensation temperature T.sub.cp1 and a Curie temperature T.sub.C1, a second magnetic layer which is disposed on the first magnetic layer and has a temperature-dependent coercivity H.sub.C2 (T), a compensation temperature T.sub.cp2 and a Curie temperature T.sub.C2, and a third magnetic layer which is disposed on the second magnetic layer and has a temperature-dependent coercivity H.sub.C3 (T), a compensation temperature T.sub.cp3 and a Curie temperature T.sub.C3, where:T.sub.a <T.sub.f <T.sub.m .ltoreq.T.sub.cp1 .ltoreq.T.sub.cp2 <T.sub.C2 <T.sub.r <T.sub.C1 <T.sub.cp3 <T.sub.C3 .ltoreq.T.sub.wandH.sub.C1 (T)<H.sub.e for T.sub.a <T<T.sub.mH.sub.C2 (T)<H.sub.e for T.sub.a <T<T.sub.mH.sub.C3 (T)>H.sub.e for T<T.sub.w.