Asymmetric field dependence of magnetoresistance in magnetic films

Details Asymmetric field dependence of magnetoresistance in magnetic films Asymmetric field dependence of magnetoresistance in magnetic films

2009-04-19

arxiv.org/abs/0904.2898v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures, to be published in Phys. Rev. B

Scientific paper

We study an asymmetric in field magnetoresistance that is frequently observed in magnetic films and, in particular, the odd longitudinal voltage peaks that appear during magnetization reversal in ferromagnetic films, with out-of-plane magnetic anisotropy. We argue that the anomalous signals result from small variation of magnetization and Hall resistivity along the sample. Experimental data can be well described by a simple circuit model, the latter being supported by analytic and numerical calculations of current and electric field distribution in films with a gradual variation of the magnetization and Hall resistance.

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