Perpendicular magnetic recording medium and magnetic storage device

A technology of perpendicular magnetic recording and media, which is applied in the direction of recording information storage, magnetic recording, data recording, etc., can solve the problems of long-term reliability decline and information loss of perpendicular magnetic recording media, and achieve the effect of preventing wide-area track erasure

Inactive Publication Date: 2007-10-03
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When wide-area track erasure occurs, the recorded information is lost and the long-term reliability of the perpendicular magnetic recording medium decreases

Method used

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  • Perpendicular magnetic recording medium and magnetic storage device
  • Perpendicular magnetic recording medium and magnetic storage device
  • Perpendicular magnetic recording medium and magnetic storage device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0043] FIG. 1 is a cross-sectional view showing an example of a perpendicular magnetic recording medium according to a first embodiment of the present invention.

[0044] As shown in Figure 1, the perpendicular magnetic recording medium 10 comprises: a substrate 11; and a first liner 12, a separation layer 16, a second liner 18, an intermediate layer 22, a recording layer 23, protective film 24 and lubricating layer 25 .

[0045] In FIG. 1 , the arrow directions in the first liner 12 and the second liner 18 schematically represent the directions of easy magnetization axes, and the arrow orientations represent the orientations of residual magnetization when no external magnetic field is applied. In FIGS. 3 and 4 below, the arrows are defined the same as in FIG. 1 .

[0046] Referring to FIG. 1 to continue explaining, the first underlayer 12 includes: an amorphous soft magnetic layer 13 and an amorphous soft magnetic layer 15 , and a non-magnetic coupling layer 14 between them....

example 1

[0119] As a first example of this embodiment, a perpendicular magnetic recording medium as described below was manufactured. The perpendicular magnetic recording medium of this example has the same structure as the perpendicular magnetic recording medium 30 of FIG. 3 . Therefore, in the following, the same reference numerals as in FIG. 3 are used. The values ​​in parentheses are film thicknesses.

[0120] Specifically, the perpendicular magnetic recording medium of this example includes the following components.

[0121] Substrate 11: a glass substrate;

[0122] The first liner 12 includes:

[0123] Amorphous soft magnetic layers 13, 15: CoNbZr film (25nm for each film), and

[0124] Non-magnetic coupling layer 14: Ru film (0.6nm);

[0125] Separation layer 16: Ta film (3nm);

[0126] The second liner 18, comprising:

[0127] Polycrystalline soft magnetic layers 19, 21: Ni 80 Fe 20 film, and

[0128] Non-magnetic coupling layer 20: Ru ​​film (0.6nm);

[0129] Interm...

example 2

[0143] As a second example of this embodiment, a perpendicular magnetic recording medium as described below was fabricated. The perpendicular magnetic recording medium of this example has the same structure as the perpendicular magnetic recording medium 30 of FIG. 3 . Therefore, in the following, the same reference numerals as in FIG. 3 are used. The values ​​in parentheses are film thicknesses.

[0144] Specifically, the perpendicular magnetic recording medium of this example includes the following components.

[0145] Substrate 11: a glass substrate;

[0146] The first liner 12 includes:

[0147] Amorphous soft magnetic layers 13, 15: CoNbZr film (25nm for each film), and

[0148] Non-magnetic coupling layer 14: Ru film (0.6nm);

[0149] Separation layer 16: Ta film (3nm);

[0150] The second liner 18, comprising:

[0151] Polycrystalline soft magnetic layers 19, 21: Ni 80 Fe 20 film (5nm), and

[0152] Non-magnetic coupling layer 20: Ru ​​film (0.6nm);

[0153] I...

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Abstract

A perpendicular magnetic recording medium is disclosed that is able to prevent the Wide Area Track Erasure phenomenon from occurring and is capable of high density recording. The perpendicular magnetic recording medium includes a substrate; a soft-magnetic backup stack structure including a first magnetic layer, a first non-magnetic coupling layer, and a second magnetic layer stacked on the substrate in order; an intermediate layer formed from a non-magnetic material on the soft-magnetic backup stacked structure; and a recording layer on the intermediate layer, the recording layer having an easy axis of magnetization perpendicular to the surface of the substrate. The first magnetic layer and the second magnetic layer are formed from a poly-crystal soft-magnetic material, each of the first magnetic layer and the second magnetic layer has an easy axis of magnetization in the surface thereof, and the magnetization of the first magnetic layer and the magnetization of the second magnetic layer are coupled and anti-parallel to each other.

Description

[0001] Cross References to Related Applications [0002] This patent application is based on the priority of Japanese Patent Application No. 2006-100594 filed on March 31, 2006, the entire contents of which are hereby incorporated by reference. technical field [0003] The invention relates to a perpendicular magnetic recording medium and a magnetic storage device. Background technique [0004] Magnetic storage devices are used in a wide variety of devices ranging from large-scale systems to personal-use computers and communication devices. In all applications of magnetic memory devices, further increases in recording density and data transfer speed are required. [0005] In recent years, in the in-plane recording technology currently used as the main magnetic recording method, a recording layer with high coercive force (i.e., high thermal stability of remanent magnetization) is employed to prevent loss of information recorded at high recording density . In order to furth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/66G11B5/667G11B5/738H01F1/01
CPCG11B5/855G11B5/66G11B5/667G11B5/62G11B5/674G11B5/678
Inventor 安东尼·阿扬杉本利夫稻村良作金子大树
Owner FUJITSU LTD
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