The theory of GMR and TMR in segmented magnetic nanowires

Details The theory of GMR and TMR in segmented magnetic nanowires The theory of GMR and TMR in segmented magnetic nanowires

2000-02-21

arxiv.org/abs/cond-mat/0002325v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 8 figures

Scientific paper

We calculate the resistivity and Giant Magnetoresistance (GMR) of a segmented nanowire consisting of two ferromagnetic segments separated by a thin paramagnetic spacer. The quantization of the electron motion due to the small nanowire cross-section is taken into account; s-d electron scattering gives rise to different mean free paths for spin-up and spin-down s-electrons. The calculated resistivity and GMR oscillate as a function of nanowire cross-section due to the difference in Fermi momenta of d-electrons with opposite spins. The GMR can reach values much higher than those which are obtained for "wires" of infinite cross-section (i.e., a multilayer). Similarly we have calculated the Tunneling Magnetoresistance (TMR) by replacing the paramagnetic spacer with an insulator spacer.

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