Magnetoresistive (MR) sensor with coefficient enhancing that pro

Details Magnetoresistive (MR) sensor with coefficient enhancing that pro Magnetoresistive (MR) sensor with coefficient enhancing that pro

1996-09-26

1998-03-24

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

057319367

ABSTRACT:
An MR sensor with an improved MR coefficient and improved thermal stability is provided by employing one or more chromium based spacer layers which are interfacially adjacent a Permalloy (NiFe) stripe. The chromium based spacer layers may be NiFeCr or NiCr. The best compositions have been found to be (Ni.sub.89 Fe.sub.21).sub.60 Cr.sub.40 and Ni.sub.60 Cr.sub.40. For NiCr the MR coefficient of the MR stripe is most enhanced when the NiCr layer is deposited on a layer of tantalum (Ta). Further, when the thicknesses of the NiFeCr and the NiCr layers are 25 .ANG. and 50 .ANG. respectively the MR coefficients are optimized. Both spacer layers have a high resistance compatible with low shunting of the sense current.

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