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Perpendicular magnetic recording media, production process thereof, and perpendicular magnetic recording and reproducing apparatus

A magnetic recording medium and magnetic recording technology, applied in magnetic recording, magnetic recording heads, magnetic objects, etc., can solve the problems of signal-to-noise ratio reduction, soft magnetic bottom layer and perpendicular magnetic recording layer magnetic performance degradation, high temperature, etc.

Active Publication Date: 2008-01-23
TOHOKU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process requires higher temperatures and causes degradation of the magnetic properties of the soft magnetic underlayer and the perpendicular magnetic recording layer.
When using a soft magnetic underlayer uniformly magnetized in the radial direction, read and write characteristics degrade, especially SNR (signal-to-noise ratio) degrades

Method used

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  • Perpendicular magnetic recording media, production process thereof, and perpendicular magnetic recording and reproducing apparatus
  • Perpendicular magnetic recording media, production process thereof, and perpendicular magnetic recording and reproducing apparatus
  • Perpendicular magnetic recording media, production process thereof, and perpendicular magnetic recording and reproducing apparatus

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Embodiment Construction

[0053] The present invention relates to a magnetic disk medium employing a perpendicular magnetic recording method, wherein

[0054] (1) In the structure of the soft magnetic bottom layer, at least two soft magnetic layers and Ru or Re positioned between the two soft magnetic layers are provided, and the easy magnetization axis of the soft magnetic bottom layer has a desired direction,

[0055] (2) the easy axis of magnetization is substantially distributed along a direction other than the radial direction of the non-magnetic substrate,

[0056] (3) The bias field of the antiferromagnetic coupling along the easy axis direction of the soft magnetic underlayer is 10 Oersted (790 A / m) or more.

[0057] Also, the area of ​​the portion where the axis of easy magnetization is distributed in a direction other than the radial direction of the non-magnetic substrate accounts for 50% or more of the area of ​​the entire soft magnetic underlayer. 75% or greater is preferred. More prefer...

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Abstract

The invention discloses a perpendicular magnetic recording medium capable of realizing high-density recording and reproducing of information, its manufacturing process, and a magnetic recording and reproducing device. The provided perpendicular magnetic recording medium has at least a soft magnetic bottom layer and a perpendicular magnetic recording layer positioned on a disc-shaped non-magnetic substrate, wherein the soft magnetic bottom layer has at least two soft magnetic layers and Ru or The Re layer; the easy magnetization axis of the soft magnetic underlayer has a desired direction; the easy magnetization axis of the soft magnetic underlayer is distributed substantially along directions other than the radial direction of the nonmagnetic substrate, and along the easy axis of the soft magnetic underlayer The bias field for the antiferromagnetic coupling in the direction of the magnetization axis is 10 Oersted (790 A / m) or more.

Description

[0001] Cross References to Related Applications [0002] Priority is claimed from Japanese Patent Application No. 2005-24946 filed on February 1, 2005. This application is an application filed pursuant to 35 U.S.C. §111(a) and an application pursuant to 35 U.S.C. §119(e) of provisional application 60 / 650,534 filed February 8, 2005 under 35 U.S.C. §111(b) day. technical field [0003] The present invention relates to a perpendicular magnetic recording medium, a method of manufacturing such a medium, and a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium. Background technique [0004] In the perpendicular magnetic recording method, the easy axis of the magnetic recording layer is aligned along a direction perpendicular to the medium, whereas in conventional media the easy axis of the magnetic recording layer is aligned in the plane of the medium; thus, magnetization switching is reduced The defield field in the vicinity of the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/667G11B5/738G11B5/82G11B5/84G11B5/852H01F10/26
CPCG11B5/1278G11B5/8404G11B5/667H01F10/30H01F10/3286G11B5/676
Inventor 高桥研冈正裕喜喜津哲
Owner TOHOKU UNIV
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