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Magnetoresistance in a deformed Cu-Ni-Fe alloy with ultrafine multilayer structure

Published online by Cambridge University Press:  03 March 2011

L.H. Chen ,
S. Jin ,
T.H. Tiefel  and
R. Ramesh
L.H. Chen
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974-0636
S. Jin
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974-0636
T.H. Tiefel
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974-0636
R. Ramesh
Affiliation:
Bellcore, Red Bank, New Jersey 07701
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Abstract

The creation of a giant magnetoresistance (GMR) effect in a spinodally decomposed and deformed Cu-20% Ni-20% Fe alloy is reported. The alloy is processed to contain a locally multilayered superlattice-like structure with alternating ferromagnetic and nonmagnetic layers with a size scale of 10-20 Å. The microstructural modification produced a dramatic improvement in room-temperature magnetoresistance ratio from ∼0.6 to ∼5%. The observed magnetoresistance is most likely related to the spin-dependent scattering at the two-phase interface and in the ferromagnetic phase, although the exact mechanism involved may be qualitatively different from the usual GMR picture. A rather unusual temperature-dependence of magnetoresistance ratio, i.e., the room-temperature value being greater than that at 4.2 K, was found.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1134 - 1139
Copyright
Copyright © Materials Research Society 1994

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References

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