Vertical magnetic recording medium, process for producing the same and magnetic recording apparatus

A technology of perpendicular magnetic recording and magnetic recording layer, which is applied in the direction of magnetic recording, magnetic recording layer, disc carrier manufacturing, etc., and can solve problems such as volume reduction, input signal degradation, thermal fluctuations, etc.

Inactive Publication Date: 2008-07-23
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the size of the magnetic beam means reducing its volume, which will cause problems with thermal fluctuations
That is, degradation of the input signal occurs and data disappears

Method used

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  • Vertical magnetic recording medium, process for producing the same and magnetic recording apparatus
  • Vertical magnetic recording medium, process for producing the same and magnetic recording apparatus
  • Vertical magnetic recording medium, process for producing the same and magnetic recording apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] In this example, for the figure 2 In the single-layer vertical medium of the structure, the example of changing the addition amount of Cr and B will be described.

[0068] A chemically strengthened glass substrate (for example, N-5 glass substrate manufactured by HOYA Co., Ltd.) with a smooth surface is used as the non-magnetic substrate 11. After cleaning, it is introduced into a sputtering device, and a Ta target is used under an Ar gas pressure of 5 mTorr. The first seed layer 131 made of amorphous Ta is formed with a film thickness of 10 nm, and then Ni, which is a non-magnetic Ni-based alloy, is used. 65 Fe 20 Cr 15 The target (the subscript number indicates the composition ratio in atomic %. The same applies hereinafter.), and the second seed layer 132 made of non-magnetic NiFeCr was formed with a film thickness of 15 nm under an Ar gas pressure of 20 mTorr. Furthermore, using an Ir target, under an Ar gas pressure of 30 mTorr, the base layer 14 was formed wit...

Embodiment 2

[0071] In this example, for the figure 1 In the two-layer vertical medium of the structure, an example of changing the addition amount of Cr and B will be described.

[0072] As the soft magnetic backing layer 2, Co 91 Ta 4 Zr 5 For the target, under an Ar gas pressure of 5 mTorr, an amorphous CoTaZr soft magnetic backing layer was formed with a film thickness of 150 nm as a single-layer seed layer 3 composed of nonmagnetic NiFeCr (similar to the second seed layer in Example 1) , except that the first seed layer made of Ta was not formed, all were the same as in Example 1, and a two-layer vertical medium was produced.

Embodiment 3

[0074] In this example, for the figure 2 An example of fabrication of a single-layer vertical medium with a structure changed by changing the amount of SiN added will be described.

[0075] When forming a CoPtCrB-SiN magnetic recording layer as a magnetic recording layer, use (100-z) mole % (Co 75 Pt 15 Cr 7 B 3 )-z mol% (SiN) target, in the range of z = 2 to 14, the addition amount of SiN was changed, and each was fabricated. In the same manner as in Example 1, a single-layer vertical medium was fabricated.

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Abstract

A vertical magnetic recording medium simultaneously realizing low noise and high thermal stability. There is provided a vertical magnetic recording medium comprising nonmagnetic base (1) and, sequentially superimposed thereon, at least foundation layer (4), magnetic recording layer (5), protective layer (6) and lubricant layer (7), wherein the foundation layer is constituted of at least one element selected from among Ru, Rh, Os, Ir and Pt and wherein the magnetic recording layer has a granular structure whose formulation ratio is as represented by the formula: (Co100-a-b-cPtaCrbBc)100-dMd. In the formula, M is a nitride or oxide of at least one element selected from among Cr, Al, Ti, Si, Ta, Hf, Zr, Y and Ce, 0 G11B 5 / 65 G11B 5 / 738 G11B 5 / 667 G11B 5 / 851 5 15 2 2005 / 3 / 14 1860530 2006 / 11 / 8 100405465 2008 / 7 / 23 2008 / 7 / 23 2008 / 7 / 23 Fuji Elec Device Tech Co., Ltd. Japan Watanabe Sadayuki Sakai Yasushi liu jian 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2004 / 3 / 15 072598 / 2004 2006 / 4 / 19 PCT / JP2005 / 004468 2005 / 3 / 14 WO2005 / 088609 2005 / 9 / 22 Japanese

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium mounted in various magnetic recording devices, its manufacturing method, and a magnetic recording device using the perpendicular magnetic recording medium. Background technique [0002] As a technique for achieving higher density of magnetic recording, a perpendicular magnetic recording method in which recording magnetization is perpendicular to the in-plane direction of a medium is attracting attention instead of the conventional longitudinal magnetic recording method. The perpendicular magnetic recording medium is mainly composed of the following layers, namely: a magnetic recording layer of hard magnetic material; a base layer for orienting the magnetic recording layer to the target direction; a protective layer for protecting the surface of the magnetic recording layer; A backing layer of soft magnetic material for the magnetic flux generated by the magnetic head used for re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/65G11B5/738G11B5/667G11B5/851G11B5/64G11B5/73
CPCG11B5/65G11B5/732G11B5/667G11B5/7325G11B5/7379G11B5/7368G11B5/7377G11B5/7369G11B5/737G11B5/658G11B5/657
Inventor 渡边贞幸酒井泰志
Owner FUJI ELECTRIC CO LTD
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