Optical magnetic recording medium

A magneto-optical recording and medium technology, applied in magnetic recording, magnetic recording, data recording, etc., can solve the problems of magnetic property changes, low rigidity of aluminum substrate, and not recommending the use of proximity actuators, etc., to prevent oxidation and nitriding, Effect of Stabilizing Magnetic Properties

Inactive Publication Date: 2005-02-16
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, aluminum substrates are generally less rigid and may contact the objective lens in close configurations, therefore, proximity actuators are not recommended
[0021] Also, in the case of providing the groove layer directly on the soft magnetic layer, the soft magnetic layer is exposed to the air, and the magnetic characteristics may change due to oxidation and nitriding.

Method used

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  • Optical magnetic recording medium
  • Optical magnetic recording medium
  • Optical magnetic recording medium

Examples

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Embodiment Construction

[0044] The invention will be described below based on the embodiments shown in the drawings. The present invention is not limited to these Examples.

[0045] (first example)

[0046] figure 1 is a schematic sectional view showing a magneto-optical recording medium of a first example of the present invention.

[0047]

[0048] The magneto-optical recording medium of the first example has a soft magnetic film 2, a protective film 3, a resin layer 4, a reflective film 5, a lower dielectric material film 6, a recording film 7, an upper dielectric material film 8 and a cover layer by sequentially forming on a substrate 1. The cumulative structure obtained by layer 9.

[0049] Glass, silicon, or the like having as high rigidity as possible is used as the substrate 1 .

[0050]A material having magnetic properties is used as the soft magnetic film 2 in order to concentrate the magnetic flux, and FeC, FeNi, FeAlSi, CoZrNb, etc. can be used.

[0051] The protective film 3 is mad...

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Abstract

An optical magnetic recording medium. Characterized in the it comprises a substrate and, formed thereon in the following order, a soft magnetic film, a protective film, a resin layer having a servopattern formed thereon, a reflective film, an under dielectric film, a recording layer, a upper dielectric film and a cover layer. An optical magnetic recording medium, characterized in that it comprises a substrate and, formed thereon in the following order, a soft magnetic film, a protective film, a resin layer having a servopattern formed thereon, a reflective film, an under dielectric film, a recording layer, a upper dielectric dielectric film and a cover layer.

Description

technical field [0001] The invention relates to a magneto-optical recording medium, in particular to a magneto-optical recording medium containing a soft magnetic film. Background technique [0002] Many practical examples of magneto-optical recording media are formed by stacking recording layers, protective layers, etc. on a transparent substrate, and information is recorded and reproduced by light incident on the substrate side. [0003] Miniaturization of track width and recording mark size is an exemplary way of increasing the recording density of magneto-optical recording media, for example, the spot size of a light beam irradiating the magneto-optical recording medium has been reduced. The numerical aperture NA of objective lenses currently used for magneto-optical recording media is about 0.55 to 0.6. [0004] Usually, the relationship Φ=λ / 2NA is established, where Φ is the spot size, NA is the numerical aperture of the objective lens, and λ is the laser wavelength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/02G11B5/00G11B11/105
CPCG11B11/10589G11B11/10584G11B11/1058
Inventor 山影让上村拓也玉野井健守部峰生庄野敬二
Owner FUJITSU LTD
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