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Method of producing a perpendicular magnetic recording medium and perpendicular magnetic recording medium

a technology of perpendicular magnetic recording medium, which is applied in the direction of magnetic layer protection, record information storage, instruments, etc., can solve the problems of inability to keep r/w characteristic (read/write characteristic), and it is extremely difficult to evaluate whether the carbon protective layer is coated with a lubricating layer having a sufficient film thickness to protect the carbon protective layer from damage, etc., to achieve sufficient durability and suppress the coefficient of friction low

Inactive Publication Date: 2014-01-09
WD MEDIA SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a new type of perpendicular magnetic recording medium that has a decreased floating amount. This medium includes a lubricating layer that has good durability, moisture resistance, and contamination resistance. It also has a low coefficient of friction and maintains an R / W characteristic, which is important for performance. The technical effect of this invention is to provide a perpendicular magnetic recording medium that overcomes the trade-off between durability and R / W characteristic.

Problems solved by technology

However, if the thickness of the lubricating layer is increased too much for the purpose of improving durability, moisture resistance, and contamination resistance, an R / W characteristic (read / write characteristic) cannot be kept.
In the conventional lubricant development, however, since the lubricating layer itself is made as an extremely thin film, it is extremely difficult to evaluate whether the carbon protective layer is coated with a lubricating layer having a sufficient film thickness to protect the carbon protective layer from damages.

Method used

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  • Method of producing a perpendicular magnetic recording medium and perpendicular magnetic recording medium
  • Method of producing a perpendicular magnetic recording medium and perpendicular magnetic recording medium
  • Method of producing a perpendicular magnetic recording medium and perpendicular magnetic recording medium

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embodiments

[0051]An embodiment of the method of manufacturing a perpendicular magnetic recording medium according to the present invention is described. FIG. 1 is a diagram for describing the structure of a perpendicular magnetic recording medium 100 according to the present embodiment. The perpendicular magnetic recording medium 100 depicted in FIG. 1 is configured of a disk base 110, an adhesion layer 112, a first soft magnetic layer 114a, a spacer layer 114b, a second soft magnetic layer 114c, a preliminary ground layer 116, a first ground layer 118a, a second ground layer 118b, a non-magnetic granular layer 120, a first magnetic recording layer 122a, a second magnetic recording layer 122b, a continuous layer 124, a medium protective layer 126, and a lubricating layer 128. Note that the first soft magnetic layer 114a, the spacer layer 114b, and the second soft magnetic layer 114 together form a soft magnetic layer 114. The first ground layer 118a and the second ground layer 118b together fo...

example

[0077]As an example, by using a vacuumed film forming device, the adhesion layer 112 to the continuous layer 124 were sequentially formed on the disk base 110 in an Ar atmosphere by DC magnetron sputtering. The adhesive layer 112 was of CrTi. In the soft magnetic layer 114, the composition of the first soft magnetic layer 114a and the second soft magnetic layer 114c was of CoCrFeB, and the composition of the spacer layer 114b was of Ru. The composition of the preliminary ground layer 116 was of an NiW alloy with an fcc structure. In the ground layer 118, the first ground layer 118a was formed out of Ru under high-pressure Ar, and the second ground layer 118b was formed out of Ru under low-pressure Ar. The composition of the non-magnetic granular layer 120 was of non-magnetic CoCr—SiO2. The composition of the magnetic recording layer 122 was as depicted in FIG. 1. The composition of the continuous layer 124 was of CoCrPtB. As for the medium protective layer 126, a film was formed by ...

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Abstract

A perpendicular magnetic recording medium, including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R / W characteristic. The perpendicular magnetic recording medium 100 includes a magnetic recording layer 122, a medium protective layer 126, and a lubricating layer 128 in this order on a base 110. The medium is made using a CF bond density measuring step of measuring a CF bond density of a lubricant; and a lubricating layer forming step of forming a lubricating layer with the lubricant when the measured CF bond density is 2.0×1022 to 2.7×1022 atoms / cm3.

Description

CROSS-REFERENCES TO RELATED PATENT APPLICATIONS[0001]This is a Divisional of application Ser. No. 12 / 935,215 filed Dec. 21, 2010, claiming priority based on International Application No. PCT / JP2009 / 055794, filed on Mar. 24, 2009, which claims priority from Japanese Patent Application No. 2008-088875 filed Mar. 29, 2008. The entire disclosures of the prior applications are considered part of the disclosure of the accompanying Divisional Application, and are hereby incorporated by reference in their entirety.TECHNICAL FIELD[0002]The present invention relates to a method of manufacturing a perpendicular magnetic recording medium and a perpendicular magnetic recording medium implemented on an HDD (hard disk drive) of a perpendicular magnetic recording type or the like.BACKGROUND ART[0003]With an increase in capacity of information processing in recent years, various information recording technologies have been developed. In particular, the surface recording density of an HDD using magne...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B5/725
CPCG11B5/725C10M107/38C10M111/04C10M171/00C10M177/00C10M2213/0606C10M2223/003G11B5/8408C10N2030/06C10N2030/66C10N2040/18C10N2050/023C10N2080/00G11B5/7257G11B5/672
Inventor SUZUKI, KOUTA
Owner WD MEDIA SINGAPORE PTE
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