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Magneto optic recording medium

A technology for magneto-optical recording and media, applied in the directions of magnetic recording, data recording, combined recording, etc., can solve the problem of not being able to record short marks, and achieve the effects of reducing media noise, improving CNR, and increasing recording density

Inactive Publication Date: 2006-10-11
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, when the concave-convex period formed on the surface of the reflective layer 2 is too large, short marks cannot be recorded, and as a result, high-density recording cannot be performed.

Method used

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Embodiment Construction

[0036] In one embodiment of the present invention, the magneto-optical recording medium of the present invention is a substrate on which at least a reflective layer and a recording layer are formed in this order, and a recording layer, a protective layer and a coating layer are also formed in this order. Floor.

[0037] The substrate, recording layer, protective layer and coating layer here can be formed of materials that have been conventionally used. For example, the substrate can be formed of glass or acrylic resin, the recording layer can be formed of a magnetic film such as TbFeCo, the protective layer can be formed of a nonmagnetic layer such as SiN, and the coating layer can be formed of a transparent ultraviolet curable resin.

[0038] Reflective layers are usually required to have a high heat release function. The medium of the present invention not only realizes maintaining the heat release function by forming a reflective layer with two or more thin film layers, bu...

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Abstract

A magneto-optical recording medium includes at least a reflective layer and a recording layer formed in this order on a substrate, wherein recording and reproduction of information is carried out by irradiating the medium with a laser beam from the recording layer side. The reflective layer includes two or more thin film layers different in surface roughness, wherein the thin film layer near the substrate has a surface tension smaller than that of the thin film layer near the recording layer. By designing the composition of the recording layer, the present invention will improve the coercivity and CNR of the recording layer of the magneto-optical recording medium to realize high-density recording.

Description

[0001] related application [0002] This application is related to Japanese Patent Application JP2001-383178 filed on December 17, 2001, the priority of which is claimed under 35 USC §119, the disclosure of which is incorporated by reference in its entirety. technical field [0003] The present invention relates to a magneto-optical recording medium, and more particularly to a magneto-optical recording medium in which information is recorded and reproduced by light incident from the opposite side of a substrate. Background technique [0004] Most of the conventional magneto-optical recording media that have been practically used are formed with a substrate about 1.0mm thick on which a recording layer and a protective layer have been accumulated, and the recording and reproduction of information is accomplished by light incident on the substrate of. [0005] As a means for developing a high-density magneto-optical recording medium, it has been practiced to reduce the spot si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B11/10G11B11/105
CPCG11B11/10584G11B11/10586Y10T428/12993Y10T428/12896Y10T428/12986Y10T428/24942Y10T428/12833Y10T428/12889Y10T428/31Y10T428/24355Y10T428/12812
Inventor 上村拓也田中努松本幸治
Owner FUJITSU LTD
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