Anisotropic Hanle lineshape via anisotropic magnetothermoelectric phenomena

K. Das, F.K. Dejene, B J van Wees, Ivan Vera Marun

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    Abstract

    We observe anisotropic Hanle lineshape with unequal in-plane and out-of-plane non-local signals for spin precession measurements carried out on lateral metallic spin valves with transparent interfaces. The conventional interpretation for this anisotropy corresponds to unequal spin relaxation times for in-plane and out-of-plane spin orientations as for the case of 2D materials like graphene, but it is unexpected in a polycrystalline metallic channel. Systematic measurements as a function of temperature and channel length, combined with both analytical and numerical thermoelectric transport models, demonstrate that the anisotropy in the Hanle lineshape is magneto-thermal in origin, caused by the anisotropic modulation of the Peltier and Seebeck coecients of the ferromagnetic electrodes. Our results call for the consideration of such magnetothermoelectric eects in the study of anisotropic spin relaxation.
    Original languageEnglish
    JournalPhysical Review B: covering condensed matter and materials physics
    Early online date7 Nov 2016
    DOIs
    Publication statusPublished - 2016

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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