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Discontinuous resistance change and domain wall scattering in patterned NiFe wires with a nanoconstriction

By S Lepadatu and Y B Xu

Abstract

A nonlinear current-voltage (I-V) characteristic was observed in patterned NiFe wires with a central "bow-tie" point contact constriction. By passing a dc current through the wire, a sharp resistance drop was obtained for current densities in the range of 1.1-1.4 x 10(7) A/cm(2). This is attributed to current-induced domain wall drag, resulting in displacement of a domain wall away from the constriction. A maximum current-induced resistance change of 0.079% was obtained for a 100-nm constriction, which is comparable with the magnetoresistance due to domain wall scattering in NiFe

Year: 2004
DOI identifier: 10.1109/TMAG.2004.832369
OAI identifier: oai:eprints.whiterose.ac.uk:1843

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