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Perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device

A technology of perpendicular magnetic recording and manufacturing method, which is applied in the directions of magnetic recording, magnetic recording layer, data recording, etc., and can solve the problems of reduced Ru layer thickness and poor writability, etc.

Inactive Publication Date: 2008-08-20
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the exchange field is larger, however, the thickness of the Ru layer still needs to be further reduced for us to obtain antiparallel coupling
In addition, writability deteriorates as the swap field increases

Method used

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  • Perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device
  • Perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device
  • Perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device

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Embodiment Construction

[0017] Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of a perpendicular magnetic recording medium according to an embodiment of the present invention.

[0018] In an embodiment, a disk-shaped substrate 1 is provided, and an amorphous ferromagnetic layer 2 , a spacer layer 3 and an amorphous ferromagnetic layer 4 are sequentially formed on the disk-shaped substrate 1 , as shown in FIG. 1 . The amorphous ferromagnetic layer 2 , the spacer layer 3 and the amorphous ferromagnetic layer 4 constitute a soft underlayer 11 .

[0019] For the substrate 1 , for example, a plastic substrate, a crystallized glass substrate, a tempered glass substrate, a silicon (Si) substrate, an aluminum alloy substrate, or the like is used.

[0020] As the amorphous ferromagnetic layers 2 and 4, an amorphous ferromagnetic layer containing iron (Fe), cobalt (Co), and / or nickel ...

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Abstract

The invention provides a perpendicular magnetic recording medium, manufacturing method thereof and magnetic recording device. The thickness of the spacer layer is set in such as way as to obtain the anti-parallel magnetic coupling between two amorphous ferromagnetic layers in the perpendicular medium. When the thickness of the spacer layer is changed, the exchange field shows an oscillatory behavior and the highest values of the exchange fields are obtained at various thicknesses and indicates an anti-parallel exchange between them. A conventional recording medium applies the smallest thickness (1st APS) among the thicknesses corresponding to the exchange field maximum. On the other hand, the present invention applies the second smallest thickness (2nd APS) to obtain larger tolerance of spacer layer thickness and improved writability and enhanced recording performance.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium used in a hard disk drive and the like, a manufacturing method thereof, and a magnetic recording apparatus. Background technique [0002] Magnetic recording media such as hard disks are used as recording media for mass storage, servers, personal computers, game machines, and the like. In order to meet increasing storage demands, high-density magnetic recording media are required, and development and research of perpendicular magnetic recording media (methods) are being conducted. [0003] Reducing noise and improving writability are crucial in the development of denser perpendicular magnetic recording media. Here, writability is an index term indicating how correctly data rewriting is performed. Techniques aimed at reducing noise in a vertical medium are disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-79043 ) and Patent Document 2 (Japanese Paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/73
CPCG11B5/667G11B5/676G11B5/1278G11B5/84G11B2005/0029Y10S428/90
Inventor 安东尼·阿扬杉本利夫
Owner SHOWA DENKO KK
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