Magneto-optical recording medium
AssigneeSony Corporation
InventorsTakeshi Miki, Goro Fujita
Life of this patent
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Abstract
A magneto-optical recording medium in which the inside of grooves formed along recording tracks is a signal recording area in groove recording, and the domain wall displacement detection method is employed; and a curvature radius R1, in the cross section perpendicular to the recording tracks, of a shoulder portion of a land separating the grooves that is adjacent to the groove is 30 nm or less and a curvature radius R2, in the cross section perpendicular to the recording tracks, of the inside edge portion of the groove for the recording that is adjacent to the land is 20 nm or more, so that a wide recording power margin can be obtained, the jitter can be improved, and the error rate can also be improved.
Claims8
A magneto-optical recording medium in which the inside of grooves of recording tracks is a signal recording area, and the domain wall displacement detection method is employed, wherein a curvature radius R1, in the cross section perpendicular to said recording tracks, of a shoulder portion of a land separating said grooves that is adjacent to said groove is 30 nm or less, and a curvature radius R2, in the cross section perpendicular to said recording tracks, of the inside edge portion of said groove for said recording that is adjacent to said land is 20 nm or more;
- and
- a laminated film including at least a magnetic layer formed over the grooves having a shape corresponding to the radius of curvature for the shoulder portion and inside edge portion of said groove.
A magneto-optical reproducing system comprising:
- a magneto-optical recording medium having a concave and convex surface and a laminated recording film;
- a magneto-optic reproducing head for reproducing data recorded in the magneto-optical recording medium via a domain wall displacement detection method;
- and
- wherein the inside of grooves formed along recording tracks comprises a signal recording area, wherein a curvature radius R1, in the cross section perpendicular to said recording tracks, of a shoulder portion of a land separating said grooves that is adjacent to said groove is 30 nm or less, and a curvature radius R2, in the cross section perpendicular to said recording tracks, of the inside edge portion of said groove for said recording that is adjacent to said land is 20 nm or more.
Dependencies are inferred from the claim text.