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Modulation-induced giant magnetoresistance in a spinodally decomposed Cu-Ni-Fe alloy

Publication Type

Journal Article

Authors

Jin, S., L.H. Chen, T.H. Tiefel, M. Eibschutz, Ramamoorthy Ramesh

DOI

10.1063/1.356779

Abstract

Giant magnetoresistance in a spinodally decomposed, bulk 60 Cu-20 Ni-20 Fe alloy is reported. An annealed, quenched, and heat-treated sample with a compositional modulation of ≲50 Å size exhibits a ΔR/R value as high as 9% at 4.2 K. Optimization of the ferromagnetic phase particle geometry through a combination of spinodal decomposition and uniaxial deformation led to a locally multilayered, superlattice-like structure and a dramatic increase in room-temperature magnetoresistance from ∼0.6 to ∼5%. This improvement in magnetoresistance is accompanied by a decrease in coercivity from ∼620 Oe in the fully decomposed material to ∼45 Oe in the optimized structure. Interestingly, this structure no longer exhibits the commonly observed temperature-dependent behavior of ΔR/R increasing at low temperatures, but rather shows a decrease at 4.2 K.

Journal

Journal of Applied Physics

Volume

Year of Publication

1994

ISSN

00218979

Notes

cited By 5

Research Areas

Ramesh Lab