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Perpendicular magnetic recording medium

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

Inactive Publication Date: 2012-11-14
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 subjected to Nip plating was prepared and washed. 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 target in...

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

This document discloses a perpendicular magnetic recording medium in which the magnetic anisotropy of a magnetic recording layer is raised and the thermal stability of recorded signals is improved without changing the conventional stacked configuration. A perpendicular magnetic recording medium is formed by stacking at least an intermediate layer, a second underlayer, and a magnetic recording layer in this order on a nonmagnetic base. The intermediate layer is either a single layer of Ru or a Ru-based alloy, or a stacked structure of a nonmagnetic alloy film including Co and Cr and a film of Ru or a Ru-based alloy. The second underlayer includes Co in the range from 30 at % to 75 at %, Cr in the range from 20 at % to 60 at %, and W in the range from 0.1 at % to 10 at %, and has a thickness in the range from 0.1 nm to 1.0 nm.

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 Applications(China)
IPC IPC(8): G11B5/667G11B5/71
CPCG11B5/65G11B5/7325G11B5/7369G11B5/657G11B5/658
Inventor 穗积康彰
Owner FUJI ELECTRIC CO LTD
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