Spin valve read head with low moment, high coercivity pinning la

Details Spin valve read head with low moment, high coercivity pinning la Spin valve read head with low moment, high coercivity pinning la

1997-07-25

1999-02-02

Evans, Jefferson

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11R 539

Patent

active

058673512

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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