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Perpendicular magnetic recording medium

A technology for perpendicular magnetic recording and media, applied in the direction of magnetic recording, data recording, recorded information storage, etc., can solve the problem of writing performance degradation

Inactive Publication Date: 2006-05-03
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the miniaturization of the reverse magnetization unit and the increase of Ku, which can lead to an increase in recording density, can improve the thermal stability and noise properties of the magnetic recording medium, both of these situations lead to the performance of writing (ease of recording on the magnetic recording medium) degree) decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1 and comparative example 1,2 use figure 1 The structures shown were prepared with different amounts of platinum added to the magnetic layer.

[0065] The non-magnetic substrate 1 used was a disc-shaped chemically strengthened glass substrate (N-10 glass substrate produced by HOYA Co.), which had a diameter of 65 mm and a thickness of 0.635 mm. After cleaning, the substrate was loaded into the sputtering device and coated with Co 8 Zr 5 Nb (the number indicates the atomic percentage, containing 8 atomic % of zirconium, 5 atomic % of niobium, and the rest is cobalt; a similar marking method is used in the following description) is used as the target, and an amorphous CoZrNb soft magnetic backing with a thickness of 200 nm is deposited Layer 2. A 5 nm thick amorphous seed layer was then deposited with tantalum. Next, use Ni 12 Fe 8 B is used as a target, and a crystal seed layer with a thickness of 5 nm is deposited to form a seed layer 3 . Using rutheni...

preparation Embodiment 2 and comparative example 3、4

[0071] When preparing Example 2 and Comparative Examples 3 and 4, change the SiO in the magnetic layer 2 , the amount of Pt and Cr.

[0072] Example 2 was prepared in the same manner as Example 1, except that the target composition for the magnetic layer was 85 mol% (Co 8 Cr 25 Pt)-15mol%SiO 2 .

Embodiment 3

[0078] Embodiment 3 adopts oxide Cr 2 o 3 .

[0079] Example 3 was prepared in the same manner as in Example 1, except that the target composition for the magnetic layer was 90 mol % (Co 5 Cr 16 Pt)-10mol%Cr 2 o 3 .

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Abstract

An object of the present invention is to provide a perpendicular magnetic recording medium which improves writing performance without destroying thermal stability and electromagnetic conversion characteristics such as noise performance. The perpendicular magnetic recording medium of the present invention includes at least a non-magnetic bottom layer 4 and a magnetic layer 5. After grazing incidence X-ray diffraction measurement, the ratio A / B of ferromagnetic grains is between 0.2-1.5, where A represents the integrated intensity of the fcc(111) peak obtained at an angle of 69.5° on the χ axis, and B represents the integrated intensity of the fcc(111) peak on the χ axis. The integrated intensity of the hcp(101) peak obtained at an angle of 60.2°. The medium preferably contains a soft magnetic backing layer 2 and a seed layer 3 . The seed layer 3 is preferably laminated with an amorphous structure layer and an fcc or hcp crystal structure layer.

Description

[0001] Related literature [0002] This application is based on and claims priority from Japanese Patent Application No. 2004-262128 filed on September 9, 2004, the contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a perpendicular magnetic recording medium for reading and writing information, in particular to a perpendicular magnetic recording medium installed in a hard disk drive (HDD). technical background [0004] At present, the magnetic recording medium adopts the longitudinal recording method, and the magnetic cobalt-based alloy layer is formed on the substrate through the bottom layer composed of chromium, chromium alloy, etc., and the recording magnetization direction is on the substrate plane. As the demand for high recording density of magnetic recording media increases year by year, research and development activities on perpendicular magnetic recording media are active because such recording media ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/66G11B5/667H01F10/08
CPCG11B5/7379G11B5/73921G11B5/7368G11B5/73923G11B5/737G11B5/73919G11B5/658
Inventor 久保木孔之
Owner FUJI ELECTRIC CO LTD