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Magnetic recording medium

A magnetic recording medium and magnetic layer technology, applied in magnetic recording, magnetic recording layer, data recording, etc., can solve problems such as deterioration of thermal stability

Inactive Publication Date: 2005-02-02
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the crystal grains used for the magnetic recording layer are extremely refined, or when Brt is greatly reduced, the thermal stability deteriorates, so there is a limit to the reduction of noise

Method used

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  • Magnetic recording medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] figure 1 The cross-sectional structure of Example 1 of the magnetic recording medium according to the present invention is shown. After alkali washing and drying of the aluminosilicate glass substrate whose surface is chemically strengthened, Ar gas is introduced into a vacuum, and a sputtering method is used at room temperature to form a structure formed by adding 35 at% Ta to Ni. A 30-nm-thick alloy film as the first underlayer 11 and a 2nm-thick layer as the second underlayer 12 with Ta as the main component. Then, it is heated in a vacuum with a lamp heater so that the temperature of the substrate is about 300 degrees Celsius to form a 10 nm thick Cr-15at%Ti-5at%B alloy layer as the third underlayer 13. In addition, a Cr-15at%Ti-5at%B alloy layer with a thickness of 10 nm is formed as the third underlayer 13. In addition, a 3nm thick first magnetic layer 14 containing a Co-14at%Cr-6at%Pt alloy, a 0.6nm thick first intermediate layer containing Ru, a second magnetic lay...

example 2

[0052] In the same manner as in Example 1, the following alloy targets were prepared by setting the contents of Pt and B constant and changing the ratio of Co to Cr as used for the second magnetic layer 16 having Co as the main component and used for The material of the third magnetic layer 13 with Co as the main component:

[0053] Co-13at%Cr-14at%Pt-8at%

[0054] Co-14at%Cr-14at%Pt-8at%

[0055] Co-15at%Cr-14at%Pt-8at%

[0056] Co-16at%Cr-14at%Pt-8at%

[0057] Co-17at%Cr-14at%Pt-8at%

[0058] Co-18at%Cr-14at%Pt-8at%

[0059] Co-19at%Cr-14at%PL-8at%

[0060] The thickness of the second magnetic layer and the third magnetic layer were made the same so that Brt=8 Tnm, and a magnetic recording medium was formed using a target of 7 components. Table 1 shows the evaluation results of the rewriting characteristics (O / W), S / Nd, and the output reduction rate at 65 degrees Celsius.

[0061]

Sample number

Composition of the second and third magnetic layers

OO / W

...

example 3

[0065]The magnetic recording medium was formed in the same manner as in Example 1, except that the composition of the magnetic layer was changed. The composition of the alloy target forming the second magnetic layer and the third magnetic layer is limited to the following five compositions. The additive concentration of Cr was set to 15 at%, the additive concentration of B was set to 8 at%, and Co was used to replace Pt for comparison.

[0066] Co-15at%Cr-12at%Pt-8at%B

[0067] Co-15at%Cr-13at%Pt-8at%B

[0068] Co-15at%Cr-14at%Pt-8at%B

[0069] Co-15at%Cr-15at%Pt-8at%B

[0070] Co-15at%Cr-16at%Pt-8at%B

[0071] A magnetic recording medium was prepared in the same manner as in Example 1. The alloy targets used to form the second magnetic layer and the third magnetic layer had the same composition, and the thickness of the second magnetic layer and the third magnetic layer were the same. Table 2 shows the results of the evaluation of the media.

[0072]

Sample number

...

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Abstract

Provided is a magnetic recording medium which realizes the surface recording density of >=100 megabits per 1 square millimeter. The magnetic recording medium is made by forming base layers 11, 12, and 13, a first magnetic layer 14, a first intermediate layer 15, a second magnetic layer 16, a second intermediate layer 17, a third magnetic layer 18, a protective layer 19, and a lubricating layer 20 in this order on a substrate 10. The third magnetic layer 18 and the second magnetic layer 16 are composed of a Co-based alloy containing at least Pt and Cr. The concentration of the Pt contained in the second magnetic layer 16 is equal to or below the concentration of the Pt contained in the third magnetic layer 18. In addition, the Pt contained in the third magnetic layer 18 is <=15 atom%, the concentration of the Cr contained in the third magnetic layer >=15 to <=18 atom%, and the concentration of the B contained in the third magnetic layer 18 is >=7 to <=10 atom%.

Description

Technical field [0001] The present invention relates to a magnetic recording medium capable of recording large-capacity information, particularly a magnetic recording medium suitable for high-density magnetic recording. Background technique [0002] There is an increasing demand for increasing the capacity of magnetic recording devices generally represented by magnetic disk drives. In order to meet this demand, it is desirable to obtain a high-sensitivity magnetic head or a recording medium capable of obtaining a high signal-to-noise ratio S / Nd. [0003] Generally, a recording medium includes a first underlayer called a seed layer, a second underlayer with a body-centered cubic structure including a chromium alloy, a magnetic layer, and a protective film mainly composed of carbon, which are all formed on a substrate. Bottom. For the magnetic layer, an alloy with a hexagonal close-packed structure mainly composed of cobalt is used. [0004] In order to improve S / Nd, it is effectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/64G11B5/65G11B5/66G11B5/73G11B5/738
CPCG11B5/656Y10T428/12931G11B5/66Y10T428/265G11B5/7325G11B5/7368G11B5/7369G11B5/672G11B5/678
Inventor 铃木博之神边哲也山本朋生桧上龙也
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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