Publication Type:Journal Article
Source:Journal of Materials Research, Volume 9, Number 5, p.1134-1139 (1994)
Keywords:Copper alloys, Copper nickel iron alloy, decomposition, Deformation, Electric conductivity of solids, Ferromagnetism, Giant magnetoresistance, Iron alloys, Magnetic field effects, Magnetic properties, Metallic superlattices, Metallographic microstructure, nickel alloys, Phase interfaces, Spin dependent scattering, Thermal effects
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 A. 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. © 1994, Materials Research Society. All rights reserved.
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