Magnetic recording head and magnetic disk storage apparatus mounting the magnetic head

a magnetic recording head and magnetic disk storage technology, applied in the direction of magnetic recording heads, data recording, instruments, etc., can solve the problems of degrading format efficiency, instability of reader characteristics, damage to read elements, etc., to improve format efficiency, reduce field intensity applied, and high recording density

US20050141142A1Inactive Publication Date: 2005-06-30WESTERN DIGITAL TECH INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2005-06-30
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

Embodiments of the invention provide a write head for perpendicular recording in which the magnetic field intensity applied at a read element is reduced with larger write-field gradients and the distance between a write element and a read element is small. In one embodiment, a pair of magnetic bodies for shielding a read element are provided on the leading and trailing sides of the read element respectively and whichever one of the two shields is the longer in the length from the air bearing surface is shorter than the length up to the back contact position PBK at which a main pole and an auxiliary pole are connected.
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Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This application claims priority from Japanese Patent Application No. JP 2003-427681, filed Dec. 24, 2003, the entire disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION

[0002] The present invention relates to a perpendicular recording magnetic head and a magnetic disk storage apparatus which incorporates the same.

[0003] In a magnetic disk apparatus, data on a recording medium is read or written by a magnetic head. In order to increase the capacity of the magnetic disk storage, the areal density has to be increased. However, in the conventional longitudinal recording method, the thermal fluctuation in medium magnetization prevents one from achieving the higher areal density. A solution to this problem is to employ a perpendicular recording method whereby the recorded magnetizations are aligned in the direction perpendicular to the medium.

[0004] The perpendicular recording method is available in two ty...

Examples

Embodiment Construction

[0029] Next, exemplary embodiments of the present invention will be described referring to the accompanying drawings.

[0030]FIG. 1 is a conceptual diagram showing a magnetic disk apparatus according to an embodiment of the present invention. In this magnetic disk apparatus, a magnetic head mounted on a slider 13 fixed to the tip of a suspension arm 12 writes and reads magnetization signals at a given position on a magnetic disk 11 which is rotated by a motor 24. A rotary actuator 15 is driven to select a magnetic head position (track) in the magnetic disk radial direction. A write signal to the magnetic head and a read signal from the magnetic head are processed by signal processing circuits 35a and 35b.

[0031]FIG. 2 schematically shows a perpendicular recording head according to an embodiment of the present invention, where FIG. 2(a) is a cross-section view and FIG. 2(b) a plan view from the air bearing surface (ABS). This magnetic head is a write / read combination head which has a ...