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perpendicular magnetic recording media

A technology of perpendicular magnetic recording and magnetic recording layer, applied in magnetic recording, data recording, recording information storage, etc.

Inactive Publication Date: 2018-01-30
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of this remarkable growth, the in-plane recording method used so far is approaching the limit of high density

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0040] As the non-magnetic substrate 10 , an Al substrate (S13 aluminum substrate manufactured by Fuji Electric Device Technology Co., Ltd.) having a smooth surface and subjected to Nip plating was prepared and cleaned. The cleaned non-magnetic substrate 10 is introduced into a DC magnetron sputtering device. Next, a Co54Fe9Ta6Zr target (consisting of 54at% Fe, 9at% Ta, 6at% Zr, and the remainder of Co on the basis of all atoms. The same applies hereinafter) was used to form a film with a thickness of 30nm in Ar gas at a pressure of 0.67Pa. Co54Fe9Ta6Zr amorphous soft magnetic backing layer 20. Next, a Ni20Cr2Si first base layer 30 with a film thickness of 6 nm was formed using a Ni20Cr2Si target in Ar gas at a pressure of 0.67 Pa. The obtained Ni20Cr2Si film has fcc structure. Next, in Ar gas at a pressure of 4.0 Pa, an Ru intermediate layer 40 with a film thickness of 8 nm was formed using a Ru target. Next, a Co26Cr2W second base layer 50 was formed using a Co26Cr2W targ...

Embodiment 2

[0042] A perpendicular magnetic recording medium was produced by the same procedure as in Example 1 except that the composition of the target was changed to Co38Cr2W when forming the second base layer 50 .

Embodiment 3

[0044] A perpendicular magnetic recording medium was produced by the same procedure as in Example 1 except that the composition of the target was changed to Co42Cr2W when forming the second base layer 50 .

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Abstract

The present invention provides a perpendicular magnetic recording medium, which can improve the magnetic anisotropy of the magnetic recording layer without changing the existing lamination structure, thereby improving the thermal stability of the recording signal. A perpendicular magnetic recording medium is a perpendicular recording medium at least sequentially laminated with an intermediate layer, a second base layer and a magnetic recording layer on a non-magnetic substrate, wherein the intermediate layer is a single-layer structure of Ru or a Ru-based alloy, Or it is a laminated structure of a non-magnetic alloy layer containing Co and Cr and a layer of Ru or Ru-based alloy, and the second base layer contains Co of 30 at% or more and 75 at% or less, Cr of 20 at% or more and 60 at% or less, and 0.1 at% W in the above 10 at % or less, the second base layer has a film thickness of 0.1 nm to 1.0 nm inclusive.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium mounted on various magnetic recording devices. More specifically, it relates to a perpendicular magnetic recording medium mounted on a hard disk drive (HDD) used as an external storage device such as a computer or AV equipment. Background technique [0002] After 1997, the recording density of HDDs increased rapidly at an annual rate of 60-100%. As a result of this remarkable growth, the in-plane recording method used so far has approached the limit of high density. In view of this situation, in recent years, attention has been drawn to a perpendicular recording method capable of increasing the density, and research and development thereof have been greatly promoted. Moreover, since 2005, the commercialization of HDDs adopting the perpendicular recording method in some models has finally begun. [0003] The perpendicular magnetic recording medium comprises: a base layer compr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/667G11B5/71
CPCG11B5/7369G11B5/657G11B5/658
Inventor 穗积康彰
Owner FUJI ELECTRIC CO LTD
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