Sagneto-optical recording medium and its production method

A technology of magneto-optical recording and manufacturing method, applied in magnetic recording, optical recording/reproducing, data recording, etc., can solve the problems of inability to reproduce magnetic signals, decrease the amplitude of readout signals, etc., and achieve the effect of improving jitter characteristics

Inactive Publication Date: 2004-11-03
SONY CORP
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Problems solved by technology

Therefore, only the magneto-optical signal can be reproduced from the medium temperature region and the magnetic signal of the region where the mask has been formed cannot be reproduced
[0007] However, in order to achieve the miniaturization of the recording marks as described above, a sudden decrease in the amplitude in the readout signal will become a problem

Method used

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  • Sagneto-optical recording medium and its production method
  • Sagneto-optical recording medium and its production method
  • Sagneto-optical recording medium and its production method

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Embodiment Construction

[0038] An embodiment of the present invention will be described below with reference to the accompanying drawings. In all subsequent schematic diagrams of the embodiments, the same or corresponding parts are indicated by the same reference numerals.

[0039] First, a magneto-optical disk according to an embodiment of the present invention will be described. Fig. 2 shows a magneto-optical disk according to the first embodiment.

[0040] As shown in FIG. 2, the magneto-optical disk 1 according to this embodiment is formed by sequentially laminating a first dielectric layer 3, a first magnetic layer 4, a second magnetic layer 5, and a third magnetic layer on a main plane of a disk base 2. 6. The second dielectric layer 7, the reflective layer 8 and the protective layer 9 are formed.

[0041] The disc base 2 is produced by molding a resin material into a disc shape, for example, by an injection molding method. For example, glass 2P or the like or a synthetic resin material such...

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Abstract

A magneto-optical disk (1) comprises a disk substrate (2) having lands and grooves on and in a major surface thereof, a first dielectric layer (3), a multilayer magnetic film (10) including a first magnetic layer (4) having a vertical magnetic isotropy at room temperature, a second magnetic layer (5) having a plane magnetic isotropy at room temperature, and a third magnetic layer (6) having a vertical magnetic isotropy at room temperature, a second dielectric layer (7), a reflective layer (8), and a protective layer (9) all the layers and film being formed on the disk substrate (2) in order. The saturation magnetization of the second magnetic layer (5) is 8.80*10-2 to 1.76*10-1 Wb / m2. The gas pressure under which the second magnetic layer (5) is formed is 0.6 to 3.0 Pa. The third magnetic layer (6) contains 15 to 17 atom% of Co.

Description

technical field [0001] The invention relates to a magneto-optical recording medium and a manufacturing method, in particular to a magneto-optical recording medium and a manufacturing method suitable for a magneto-optical disk, a magneto-optical tape and a magneto-optical card capable of performing magnetic induction super-definition reproduction. Background technique [0002] Heretofore, the recording capacity of the magneto-optical disc has been further increased in connection with realizing high-density recording marks in the magneto-optical disc. In order to increase the recording capacity as described above, one method used to achieve high-density recording is to reduce the length of recording marks, narrow track pitches, and miniaturize recording pits. [0003] As a means of efficiently realizing such a high density, a magnetic induction super-resolution technology (MSR) capable of reproducing a recording mark smaller than a laser beam spot diameter has been proposed (f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/00G11B11/105
CPCG11B11/10586G11B7/00G11B11/105
Inventor 和田丰中山比吕史
Owner SONY CORP
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