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Nonlinear Giant Magnetoresistance in Dual Spin Valves

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  • A. Aziz
  • O. P. Wessely
  • M. Ali
  • D. M. Edwards
  • C. H. Marrows
  • B. J. Hickey
  • M. G. Blamire
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Article number237203
<mark>Journal publication date</mark>4/12/2009
<mark>Journal</mark>Physical review letters
Issue number23
Volume103
Number of pages4
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

Giant magnetoresistance (GMR) arises from differential scattering of the majority and minority spin electrons by a ferromagnet (FM) so that the resistance of a heterostructure depends on the relative magnetic orientation of the FM layers within it separated by nonmagnetic spacers. Here, we show that highly nonequilibrium spin accumulation in metallic heterostructures results in a current-dependent nonlinear GMR which is not predicted within the present understanding of GMR. The behavior can be explained by allowing the scattering asymmetries in an ultrathin FM layer to be current dependent.

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© 2009 The American Physical Society