Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for fabricating magnetic recording medium, and magnetic recording/reproducing apparatus

一种磁记录介质、磁记录的技术，应用在磁记录、数据记录、记录信息存储等方向，能够解决再现输出低、提高、难SNR等问题，达到高记录密度、抑制信号干扰、高记录密度特性的效果

Inactive Publication Date: 2011-01-26
RESONAC HOLDINGS CORPORATION
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this operation is that the influence of adjacent tracks can be minimized, but the disadvantage is that the reproduction output is rather low
This also makes it difficult to increase the SNR to the desired high level

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for fabricating magnetic recording medium, and magnetic recording/reproducing apparatus
  • Method for fabricating magnetic recording medium, and magnetic recording/reproducing apparatus
  • Method for fabricating magnetic recording medium, and magnetic recording/reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0212] Place the glass substrate for HD in a vacuum chamber, and evacuate the chamber to no more than 1.0×10 -5 Pa pressure to remove air. The glass substrates used include Li 2 Si 2 o 5 、Al 2 o 3 -K 2 O, Al 2 o 3 -K 2 O, MgO-P 2 o 5 and Sb 2 o 3 - A glass-ceramic of composition ZuO and having an outer diameter of 65 mm and an inner diameter of 20 mm and an average surface roughness (Ra) of 2 Angstroms.

[0213] On the glass substrate, a soft magnetic underlayer made of 60Fe30Co10B, an intermediate layer made of Ru and a soft magnetic layer made of 70Co-5Cr-15Pt-10SiO were sequentially formed by DC sputtering. 2 A magnetic layer composed of an alloy with a granular structure. A carbon mask layer is formed on the magnetic layer by a P-CVD method.

[0214] Each layer has the following thicknesses. 60Fe30Co10B soft magnetic underlayer: 60 nm; Ru intermediate layer: 10 nm; magnetic layer: 15 nm; and carbon mask layer: 30 nm.

[0215] Then, SiO with a thickness of ...

example 2

[0224] By the same steps as the steps described in Example 1, a magnetic recording medium was produced in which a 10nm-thick layer made of Co10Cr20Pt8 (SiO 2 ) composed of a magnetic layer having a granular structure, and a magnetic layer having a non-granular structure composed of Co14Cr14Pt4B having a thickness of 5 nm was formed thereon. The surface layer portion of the magnetic layer having a granular structure was removed at a depth of 5.5 nm. All other conditions and steps remained the same as Example 1. The electromagnetic conversion characteristics of the magnetic recording medium were evaluated by the same procedure as in Example 1. 3T-Extrusion is 92%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
roughnessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

Provided is a method for fabricating a magnetic recording medium having a magnetically isolated magnetic recording pattern formed on at least one surface of a nonmagnetic substrate. The method includes a step of forming the magnetically isolated magnetic recording pattern by reacting part of a magnetic layer formed on the nonmagnetic substrate with ozone and changing the magnetic characteristics of a region of the magnetic layer. The magnetic layer may also have a two-layer structure in which a magnetic layer having a non-granular structure is formed on a magnetic layer having a granular structure. This fabrication method makes it possible to efficiently produce a magnetic recording medium, the recording density of which is drastically increased, while maintaining recording and reproducing characteristics equal to or better than those of a conventional magnetic recording medium.

Description

technical field [0001] The present invention relates to a method of manufacturing a magnetic recording medium used in a magnetic recording / reproducing device such as a hard disk device. It also relates to a magnetic recording / reproducing device. 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 magnetic recording media used in magnetic recording devices has also been greatly improved. In particular, areal recording densities are increasing day by day because of the development of MR heads and PRML technologies. Recently, GMR heads and TMR heads have been developed, and the areal recording density is increasing at a rate of about 100% per year. Demands for further increases in recording density are still increasing, and therefore, magnetic layers with higher coercive force and higher s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/84G11B5/65G11B5/851G11B5/855H01F10/08
CPCH01F41/34G11B5/66G11B5/855G11B5/674
Inventor 福岛正人坂脇彰山根明
Owner RESONAC HOLDINGS CORPORATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com