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Vertical magnetic recording medium, method for production thereof, and magnetic recording/reproduction device

A technology for perpendicular magnetic recording and media, which is applied in the directions of magnetic recording, data recording, and record carrier manufacturing. It can solve problems such as noise increase and achieve the effect of improving recording density characteristics.

Inactive Publication Date: 2010-09-08
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide and titanium oxide contained in CoCrPt grains exert undesired effects on the orientation of magnetic grains and the dispersion of magnetic grains, which leads to an increase in noise

Method used

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  • Vertical magnetic recording medium, method for production thereof, and magnetic recording/reproduction device
  • Vertical magnetic recording medium, method for production thereof, and magnetic recording/reproduction device
  • Vertical magnetic recording medium, method for production thereof, and magnetic recording/reproduction device

Examples

Experimental program
Comparison scheme
Effect test

example 1、 comparative example 1

[0091] Place the glass substrate for HD in a vacuum chamber and evacuate the chamber to below 1.0 × 10 -5 Reduced pressure in Pa. A soft magnetic layer composed of CoNbZr and having a thickness of 50 nm was formed on a glass substrate, and then an underlying layer composed of NiFe having an fcc structure and having a thickness of 5 nm was formed on the soft magnetic layer. The soft magnetic layer and the underlying layer were formed under a reduced pressure of 0.6 Pa in an argon atmosphere by a sputtering method. An intermediate layer composed of Ru was formed on the underlying layer in two stages by a sputtering method in an argon atmosphere, that is, a Ru layer with a thickness of 10 nm was formed under a reduced pressure of 0.6 Pa in the first stage, and then The second stage further formed a Ru layer with a thickness of 10 nm under a reduced pressure of 10 Pa.

example 1-1

[0093] Example 1-1, 90(Co12Cr18Pt3Ru)-10(SiO 2 )

example 1-2

[0094] Example 1-2, 90(Co12Cr18Pt3Ru)-10(Cr 2 o 3 )

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Abstract

Disclosed is a vertical magnetic recording medium which comprises at least a soft-magnetic back layer, an under layer, an interlayer and a vertical magnetic recording layer all arranged on a non-magnetic substrate, wherein the vertical magnetic recording layer is composed of a magnetic layer having one or more constituent layers, wherein at least one constituent layer in the magnetic layer comprises a ferromagnetic crystal grain mainly composed of Co and an oxide crystal grain boundary, and wherein the ferromagnetic crystal grain contains Ru. In the vertical magnetic recording medium, all of the separation between crystal grains in the vertical magnetic recording layer, the miniaturization of crystal grain size, and the vertical orientation can be achieved. Therefore, the vertical magnetic recording medium enables the recording / reproduction of high-density information.

Description

technical field [0001] The present invention relates to a magnetic recording medium, a method of manufacturing the magnetic recording medium, and a magnetic recording and reproducing apparatus provided with the magnetic recording medium. Background technique [0002] In recent years, magnetic recording devices such as magnetic disk devices, floppy disk devices, and magnetic tape devices have been widely used, and their importance has been increasing. The recording density of the magnetic recording medium of the magnetic recording device is greatly improved. In particular, areal recording densities are increasing due to the development of MR heads and PRML technologies. Recently, GMR magnetic heads and TuMR magnetic heads have been developed, and the areal recording density is increasing at a rate of about 100% per year. [0003] There is still an increasing need to further increase the recording density in magnetic recording media, and thus, a magnetic layer with higher co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/65G11B5/66G11B5/667G11B5/851
CPCG11B5/65G11B5/66G11B5/658
Inventor 佐佐木有三桥本笃志
Owner RESONAC HOLDINGS CORPORATION