Magnetic recording medium for heat-assisted magnetic recording

一种磁记录介质、辅助磁的技术，应用在磁记录、数据记录、图案记录载体等方向

Active Publication Date: 2014-12-10
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in a magnetic recording layer formed of a granular magnetic material, a problem has been found that a plurality of magnetic crystal grains form one magnetization inversion unit (clustering: clustering)

Method used

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  • Magnetic recording medium for heat-assisted magnetic recording
  • Magnetic recording medium for heat-assisted magnetic recording
  • Magnetic recording medium for heat-assisted magnetic recording

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (Example 1)

[0053] A chemically strengthened glass substrate (N-10 glass substrate manufactured by HOYA Corporation) having a smooth surface was washed to prepare a non-magnetic substrate 10 . The cleaned non-magnetic substrate 10 is introduced into a sputtering device. CuSi heat dissipation layer 20 having a film thickness of 50 nm was formed by DC magnetron sputtering using a CuSi target in Ar gas at a pressure of 0.67 Pa.

[0054] Next, a two-layer structure seed layer 30 composed of a Ta layer and an MgO layer was formed. Specifically, a Ta layer having a film thickness of 10 nm was formed by DC magnetron sputtering using a Ta target in Ar gas at a pressure of 0.67 Pa. Next, the laminated body on which the Ta layer was formed was heated to 250° C., and a MgO layer with a film thickness of 5 nm was formed by RF sputtering using an MgO target in Ar gas at a pressure of 0.06 Pa, thereby obtaining the seed layer 30 .

[0055] Next, the laminated body on which the s...

Embodiment 2

[0059] In addition to using mixed Fe 50 Pt 50 and TiO 2 75% by volume (Fe 50 Pt 50 )-25vol%TiO 2 target, formed by Fe 50 Pt 50 -TiO 2 Except for the configuration of the upper magnetic recording layer 42, the same procedure as in Example 1 was repeated to obtain a magnetic recording medium. In this embodiment, the film thicknesses of the lower magnetic recording layer 41 and the upper magnetic recording layer 42 are also varied within the range of 2 to 8 nm, respectively.

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Abstract

Provided is a magnetic recording medium well-suited for heat-assisted recording, this magnetic recording medium having a dT / dx of 10K / nm or higher while maintaining magnetic separation between magnetic grains. This magnetic recording medium for heat-assisted magnetic recording includes at least a non-magnetic base and a magnetic recording layer, said magnetic recording layer comprising a lower magnetic recording layer and an upper magnetic recording layer. The lower magnetic recording layer has a granular structure comprising magnetic grains and a non-magnetic grain boundary which surrounds the magnetic grains and is formed from a carbon-based material. The upper magnetic recording layer has a granular structure comprising magnetic grains and a non-magnetic grain boundary which surrounds the magnetic grains and is formed from a material different from that of the non-magnetic grain boundary of the lower magnetic recording layer.

Description

technical field [0001] The present invention relates to a magnetic recording medium used for heat-assisted magnetic recording. Background technique [0002] A perpendicular magnetic recording method is employed as a technique for realizing high-density magnetic recording. A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer formed of a hard magnetic material. The perpendicular magnetic recording medium may also optionally include a substrate layer formed of a soft magnetic material, which functions to concentrate the magnetic flux generated by the magnetic head to the magnetic recording layer, and is used to direct the hard magnetic material of the magnetic recording layer toward the purpose. direction of the underlayer, protective film to protect the surface of the magnetic recording layer, etc. [0003] In Japanese Patent Laid-Open No. 2001-291230, Japanese Patent Laid-Open No. 08-083418, and International Pub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/66G11B5/02G11B5/64G11B5/65G11B5/738
CPCG11B5/65G11B2005/0021G11B5/66G11B5/743G11B5/7375G11B5/7368G11B5/7369G11B5/672G11B5/708
Inventor 内田真治
Owner FUJI ELECTRIC CO LTD
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