Method of making spin value read head with low moment, high coer

Details Method of making spin value read head with low moment, high coer Method of making spin value read head with low moment, high coer

Filed on

1998-12-29

Date issued

2000-08-22

Examiner

Hall, Carl E.

Patent Class

Metal working

SubClass

Method of mechanical manufacture

SubSubClass

Electrical device making

Other Related Categories

2960312, 2960314, 148108, 360113, G11B 542

Type

Patent

Status

active

Patent number

06105237&

Description

ABSTRACT:
A spin valve sensor is provided with a spacer layer sandwiched between a free layer and a pinned layer. The pinned layer is pinned by a pinning layer constructed of a material having a high coercivity, and a low magnetic moment. The high coercivity is employed for pinning the pinned layer, and the low moment assures that stray fields from the pinning layer do not affect the coercivity of the free layer. The magnetic moment is preferably less than 300 emu/cc and the coercivity is preferably greater than 500 Oe. The magnetic orientation of the pinning layer is set by a magnetic field at room temperature that may be applied at the suspension level. The materials with which the pinning layer may be formed are amorphous materials TbFeCo and CoSm, and a non-amorphous material CoPtCr, provided the Cr is of sufficient proportion to minimize the moment of the CoPtCr material.

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H. S. Gill et al., "Orthogonal Spin Valve Sensor Stabilized by CoSm Hard Bias Film", IBM Technical Disclosure Bulletin, vol. 39, No. 10, Oct. 1996, pp. 97-98.

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