Magneto-optical recording medium
AssigneeSony Corporation
InventorsKensuke Fijimoto, Shunichi Hashimoto, Yoshitaka Ochiai
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Abstract
A magneto-optical recording medium is disclosed in which magnetic layer has a multi-layer structure consisting of an artificial lattice film constituted by a Co layer and a Pt layer and/or a Pd layer stacked together and a rare earth-transition metal layer. High coercivity may be achieved by the rare earth-transition metal film whilst a satisfactory Kerr rotation angle in the short wavelength range may be assured by the artificial lattice film. The magneto-optical recording medium may cope with the next-generation high density recording employing a short wavelength laser.
Claims8
A magneto-optical recording medium comprising:
- a substrate;
- an artificial lattice recording film, said artificial lattice film consisting of stacked first layer of Co and second layer of an element selected from the group consisting of Pt and Pd;
- and
- a rare earth-transition metal film positioned between said artificial lattice recording film and said substrate;
- wherein;
- each first layers of said artificial lattice film has a thickness of 2-8 .ANG. if said second layer consist of Pt,
- each of said first layers of said artificial lattice film has a thickness of 1-9 .ANG. if said second layers consist of Pd,
- each of said second layers of said artificial lattice film has a thickness of 3-40 .ANG. if said second layers consist of Pt,
- each of said second layers of said artificial lattice film has a thickness of 2-40 .ANG. if said second layers consist of Pd,
- said artificial lattice film has an overall thickness of 50 to 800 .ANG.,
- said artificial lattice film and said rare earth-transition metal films are exchange coupled to one another, and
- said rare earth-transition metal film includes a rare earth metal and a transition metal.
Dependencies are inferred from the claim text.