ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A spinodally decomposed Cu-20 Ni-20 Fe alloy containing ∼500 A(ring) size ferromagnetic particles was uniaxially deformed to create a locally multilayered, superlatticelike structure with alternating ferromagnetic and nonmagnetic layers. When the size scale of each layer was made to be small, ∼15 A(ring) thick, a dramatic improvement in room-temperature magnetoresistance ratio from ∼0.6 to ∼5% was obtained. An abnormal temperature dependence of magnetoresistance ratio, i.e., the room-temperature value being greater than that at 4.2 K, was found. The observed giant magnetoresistance behavior could be explained in terms of the field-induced decrease in electron scattering in a nearly superparamagnetic material although the spin-dependent scattering at the two-phase interface and in the ferromagnetic phase may also be a contributing factor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.110963
