Inverse CPP-GMR in (A/Cu/Co/Cu) multilayers (A=NiCr, FeCr, FeV) and discussion of the spin asymmetry induced by impurities

C. Vouille*, A. Fert, A. Barthélémy, Shih-Ying Hsu, R. Loloee, P. A. Schroeder

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We present CPP-GMR experiments on a series of multilayers of the type (A/Cu/Co/Cu)×N where A is a layer of NiCr, FeCr, or FeV alloys with concentrations of Cr or V between 2.5 and 30 at %. The inverse GMR effects we observe can be accounted for by the opposite scattering spin asymmetries in Co (positive spin asymmetry) and A (negative spin asymmetry). As the spin asymmetry in A is positive for interface scattering and negative for bulk scattering, the inverse GMR is observed only for thicknesses greater than one at which interface and bulk scattering compensate. We determine the magnitude and sign of the spin asymmetry coefficients, and we notice the agreement with previous data on dilute alloys and with theoretical calculations.

Original languageEnglish
Pages (from-to)4573-4575
Number of pages3
JournalJournal of Applied Physics
Volume81
Issue number8 PART 2A
DOIs
StatePublished - 15 Apr 1997

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