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Perpendicular magnetic head and perpendicular magnetic disk apparatus

A technology of magnetic head and magnetic yoke, which is applied in the direction of magnetic recording head, orthogonal magnetization magnetic head, and magnetic head using thin film, etc. It can solve the problems of leakage at the edge of the shielding plate, insufficient external field resistance, and large adverse effects.

Inactive Publication Date: 2006-08-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present inventors have found that when an external field invades the magnetic head, magnetic flux leaks from the edge portion of the shield plate of the read head facing the magnetic disk, resulting in false erasure of data already recorded to the magnetic disk
In addition, it has been found that the detrimental effect of an external field passing through the shield plate of the read head is greater than said effect passing through the main pole
However, since the conventional magnetic disk device has only a magnetic shield member surrounding the main magnetic pole, it cannot avoid the above problems and has insufficient external field resistance.

Method used

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  • Perpendicular magnetic head and perpendicular magnetic disk apparatus
  • Perpendicular magnetic head and perpendicular magnetic disk apparatus
  • Perpendicular magnetic head and perpendicular magnetic disk apparatus

Examples

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Effect test

no. 1 example

[0021] figure 1 is a perspective view showing the main part of the perpendicular magnetic disk device according to the first embodiment, figure 2 is the front view of the perpendicular disk assembly viewed from the head pull side, and image 3 is a bottom view of the head viewed from the air bearing surface (ABS).

[0022] A magnetic disk mounted to a perpendicular magnetic disk device (so-called perpendicular dual-layer media) has a structure in which a soft magnetic underlayer 2 and a perpendicular recording layer 3 are formed on a substrate 1 . The perpendicular recording layer 3 has magnetic anisotropy in a direction perpendicular to the surface of the medium.

[0023] The magnetic head 10 mounted in the perpendicular magnetic disk device has a read head and a write head. The read head has a structure in which a magnetoresistive film (GMR film) 12 is sandwiched between shield plates 11 and 13 formed of a soft magnetic material. The write head includes a main magnetic ...

no. 2 example

[0032] Figure 6 is a perspective view showing a main part of a perpendicular magnetic disk device according to a second embodiment, Figure 7 is the front view of the perpendicular magnetic disk device viewed from the head guide side, and Figure 8 is a bottom view of the magnetic head viewed from the ABS.

[0033] Vertical dual-layer media mounted to a vertical disk unit has the same figure 1 and figure 2 A similar structure is shown. A magnetic head mounted in a perpendicular magnetic disk device has a read head and a write head. The read head has a structure in which a GMR film 12 is sandwiched between shield plates 11 and 13 formed of a soft magnetic material. The write head includes a main magnetic pole 15 , a return yoke 18 provided on the pulling side relative to the main magnetic pole 15 , and a recording coil 17 . In addition, a soft magnetic film 23 is provided so as to surround the side and top surfaces of the read head. The bottom surface of the soft magne...

no. 3 example

[0037] Figure 9 is a front view of the perpendicular magnetic disk device according to the third embodiment seen from the head pulling side.

[0038] The vertical dual-layer medium, read head, and write head in the perpendicular disk device have the same Figure 6 and Figure 8 A similar structure is shown. In this embodiment, soft magnetic films 24a and 24b divided into two are provided so as to surround the side and top surfaces of the read head. The bottom surfaces of the soft magnetic films 24a and 24b are set up to the vicinity of the magnetic disk. Also, the device is designed such that the distance s between the soft magnetic films 24a and 24b and the shield plates 11 and 13 in the read head is greater than the distance p between the soft magnetic films 24a and 24b and the soft magnetic lower layer 2 in the magnetic disk. In this way, even when the soft magnetic films 24a and 24b divided into two are provided, external fields can be prevented from invading the read...

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Abstract

According to one embodiment, a perpendicular magnetic head has a write head including a main pole, a return yoke and a recording coil, a read head including a magnetoresistive film and a pair of shields arranged so as to sandwich the magnetoresistive film, and a soft magnetic film arranged so as to surround side faces and a top face of the read head.

Description

technical field [0001] The present invention relates to perpendicular magnetic heads and perpendicular magnetic disk devices. Background technique [0002] In recent years, magnetic disk devices have been strongly required to have sufficient resistance to external magnetic fields in accordance with their reduction in size and weight. [0003] Generally, in order to improve the external field resistance of the magnetic disk device, it has been proposed, for example, to set a magnetic shielding member around the main magnetic pole of the write head, by which the external magnetic field is prevented from penetrating into the main magnetic pole, thereby reducing the adverse influence of the external field (see Japanese Patent Application Publication 2004-185672). [0004] The present inventors have found that when an external field invades the magnetic head, magnetic flux leaks from the edge portion of the shield plate of the read head facing the magnetic disk, resulting in err...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/10G11B5/31
CPCG11B5/1278
Inventor 田口知子
Owner KK TOSHIBA