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Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus

A technology of perpendicular magnetic recording and medium, which is applied in magnetic recording, data recording, recording information storage, etc., and can solve the problems of poor recording/reproducing characteristics, reduced writeability of recording head, and increased recording magnetic field.

Inactive Publication Date: 2008-06-04
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this also increases the recording magnetic field necessary for magnetization reversal for data writing, the writeability of the recording head decreases
As a result, recording / reproducing characteristics deteriorate

Method used

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  • Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
  • Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
  • Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0111] The present invention will be explained in more detail below with reference to examples.

example 1

[0113] A 2.5-inch hard disk type non-magnetic glass substrate (TS-10SX manufactured by OHARA) was placed in a vacuum chamber of a C-3010 sputtering apparatus manufactured by ANELVA.

[0114] The vacuum chamber of the sputtering equipment is evacuated to 1×10 -5 After Pa or less, 100-nm-thick Co 90 Zr 5 Nb 5 thin film as a soft magnetic underlayer, a 20-nm thick Ru thin film as a nonmagnetic underlayer, and a 20-nm thick (Co 76 -Cr 6 -Pt 18 )-8mol%SiO 2 thin film as a hard magnetic recording layer, Co 35 Ni 65 -8mol% SiO 2 thin film as a soft magnetic recording layer, and a 5-nm thick C thin film as a protective layer. The film thickness of the soft magnetic recording layer can be varied within the range of 1 to 20 nm. After the thin film was formed, the surface of the protective layer was coated with a 13-angstrom-thick perfluoropolyether (PFPE) lubricant by a dipping method, thereby obtaining a perpendicular magnetic recording medium.

[0115] FIG. 7 is a schematic...

example 2

[0157] In addition to replacing the 20-nm thick (Co 76 -Cr 6 -Pt 18 )-8mol%SiO 2 thin film using Fe-Ni-8mol%SiO 2 , Co-Ni-8mol% SiO 2 , and Fe-Co-8mol% SiO 2 The perpendicular magnetic recording medium was produced in the same procedure as in Example 1 except that any one of them was used as the soft magnetic recording layer, and the composition ratios of these Fe-Ni, Co-Ni and Fe-Co alloys were varied. The film thickness of the soft magnetic recording layer was fixed at 4 nm.

[0158] Each alloy composition is changed by adjusting the target alloy composition.

[0159] The XRD evaluation results show that the magnetic grains in the hard magnetic recording layer of any perpendicular magnetic recording medium have a hcp structure and are oriented in the (0001) plane.

[0160] The results of two-dimensional TEM observation show that the hard magnetic recording layer of any perpendicular magnetic recording medium has a granular structure, in which the grain boundary region...

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Abstract

Disclosed is a perpendicular magnetic recording medium in which a magnetic recording layer has a stacked structure including a hard magnetic recording layer and soft magnetic recording layer each having magnetic crystal grains and a grain boundary region. The magnetic crystal grains in the hard magnetic recording layer contain Co and Pt, have the hcp structure, and are orientated in the (0001) plane. The magnetic recording layer has a residual squareness ratio of 0.95 or less and an irreversible reversal magnetic field of 0 Oe or less on a magnetization curve when a magnetic field perpendicular to the substrate surface is applied.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium and a magnetic recording / reproducing apparatus used in, for example, a hard disk drive using magnetic recording technology. Background technique [0002] Magnetic storage devices (HDDs) mainly used for recording and reproducing information in computers are recently beginning to be used in various applications because of their large capacity, low price, high data access speed, high reliability of data storage, etc., and They are currently used in various fields such as home video recorders, audio equipment, and car navigation systems. In recent years, as the range of applications of HDDs has continued to expand, the demand for large capacity has increased, and high-density HDDs have been increasingly developed. [0003] Magnetic recording / reproducing devices currently available on the market use a longitudinal magnetic recording method. In this method, magnetic crystal grains f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/667G11B5/673G11B5/64
CPCG11B5/65G11B5/667G11B5/676
Inventor 前田知幸
Owner KK TOSHIBA
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