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Magnetic recording medium and magnetic recording and reproducing device

A technology of magnetic recording medium and recording bit, applied in the direction of magnetic recording, magnetic recording layer, data recording, etc., can solve the problem of unstable recording, and achieve the effect of reducing the influence of thermal fluctuation and reducing crosstalk

Inactive Publication Date: 2009-10-14
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has a problem that recording becomes unstable due to thermal fluctuations because the volume of the recording bit becomes smaller due to narrowing of the bit width

Method used

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  • Magnetic recording medium and magnetic recording and reproducing device
  • Magnetic recording medium and magnetic recording and reproducing device
  • Magnetic recording medium and magnetic recording and reproducing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] According to the sputtering method, a soft magnetic underlayer (SUL) made of CoZrNb with a thickness of 50 nm was formed on the aluminum substrate, and a nonmagnetic interlayer made of Ru with a thickness of 10 nm was formed on the soft magnetic underlayer formed above, and then the On the formed nonmagnetic intermediate layer, a hard magnetic layer made of CoCrPt alloy was formed with a thickness of 15 nm.

[0071] Subsequently, a photocurable resin layer with a thickness of 15 nm was formed on the hard magnetic layer made of CoCrPt alloy, and a plurality of raised portions (80 nm in width in the radial direction (cross-track direction), concentric A mold structure with a length in the direction (along the track direction) of 60 nm) was pressed on the photocurable resin layer. Ultraviolet light (wavelength: 300nm~400nm, light intensity: 170mJ / cm 2 ) is irradiated onto the photocurable resin layer, and then the mold structure is removed from the photocurable layer, so ...

Embodiment 2

[0076] A magnetic recording medium was fabricated in the same manner as in Example 1, except that a bit pattern containing cubic convex portions with a track pitch of 120 nm was formed, and truncated pyramid-shaped recording bits with a track pitch of 120 nm were formed. The crosstalk of the produced magnetic recording medium was measured in the same manner as in Example 1. The results are shown in Figure 7 middle.

Embodiment 3

[0078] A magnetic recording medium was produced in the same manner as in Example 1, except that a bit pattern containing cubic convex portions with a track pitch of 140 nm was formed, and a truncated pyramid-shaped recording bit with a track pitch of 140 nm was formed. The crosstalk of the produced magnetic recording medium was measured in the same manner as in Example 1. The results are shown in Figure 7 middle.

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Abstract

The present invention relates to a magnetic recording medium and a magnetic recording a producing device. The magnetic recording medium contains a substrate in the shape of a disk, and a plural of recording bit formed on the substrate, wherein a bottom face of the recording bit is disposed so as to face the substrate, a top face of the recording bit is disposed so as to correspond to the bottom face of the recording bit, and Twb is larger than Twt, where Twb indicates a width of the bottom face with respect to a radius direction of the magnetic recording medium, and Twt indicates a width of the top face with respect to the radius direction.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from prior Japanese Patent Application No. 2008-101378 filed on April 9, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a magnetic recording medium and a magnetic recording and reproducing device. Specifically, the present invention relates to a magnetic recording medium such as a hard disk that realizes high recording density, and a magnetic recording and reproducing apparatus including such a magnetic recording medium. Background technique [0004] In recent years, the storage capacity of magnetic recording media has been increasing. Bit patterned media is an example of a technology that significantly increases the recording density of magnetic recording media. [0005] In bitmap media technology, the track pitch has been shortened in order to increase the recording density. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/82G11B5/66G11B5/667G11B5/73
CPCB82Y10/00G11B5/743G11B5/855G11B5/82G11B5/746
Inventor 井原宣孝竹下弘人
Owner FUJITSU LTD