Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1988-03-18
1990-09-18
Lesmes, George F.
Stock material or miscellaneous articles
Composite
Of inorganic material
428900, 204 73R, 427282, G11B 1100
Patent
active
049578243
ABSTRACT:
An information storage medium comprises a substrate, and a magnetic optical recording layer provided on the substrate. A surface portion of the recording layer has a hydrogen-doped portion having a higher hydrogen concentration than that of the other portions of the recording layer. Thus, the recording layer has two portions which have different coercive forces, though being of the same composition. The recording layer is immersed in an aqueous solution having a pH of 4 to 10, to cause hydrogenation reactions to take place on the surface of the recording layer. Another information storage medium comprises a substrate, a magneto-optical recording layer deposited on the substrate, containing a rare earth-transition metal amorphous alloy, and a protective layer deposited on the recording layer. A hydrogenated area is formed by doping hydrogen atoms in the surface portion of the recording layer before the protective layer is formed.
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Patent Abstracts of Japan, P-546, Feb. 10, 1987, vol. 11/No. 45, 61-214259 (A).
Deguchi et al., "Digital Magnetooptic Disk Drive," Applied Optics, vol. 23, No. 22, Nov. 15, 1984; pp. 3972-3978.
Coey et al., "Hydrogen in Amorphous Magnetic Alloys," J. Appl. Phys. 53(11), Nov. 1982, pp. 7804-7806.
Schelleng et al., "Hydrogenation and Magnetic Properties of Amorphous Rare-Earth-Iron (R-Fe) Alloys," J. Appl. Phys. 55(6), Mar. 15, 1984, pp. 1805-1807.
Robbins et al., "Magnetic Properties of Hydrides of Rare Earth-Transition Metal Glasses," J. Appl. Phys. 53(11), Nov. 1982, pp. 7798-7800.
Carmen Dennis
Kabushiki Kaisha Toshiba
Lesmes George F.
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