Dynamic Spin Transport in Antiferromagnetic Insulators: Non-sinusoidal Angular Dependent Spin Pumping in Y3Fe5O12(YIG)/NiO/Pt Trilayers

ORAL

Abstract

Antiferromagnets (AF), which usually serve as the passive layer in spintronics research, have recently been found as effective spin transport media in the FMR driven spin pumping measurement. For example, a YIG/Pt bilayer shows that with the insertion of a 1 nm NiO interlayer could enhance the inverse spin Hall voltage (VISHE), which scratches the surface of the promising antiferromagnetic spintronics. Recently, we studied the out-of-plane angular dependence of VISHE in YIG/NiO/Pt heterostructures with different thicknesses of NiO under a large range of temperatures. The appearance of plateaus for VISHE over the out-of-plane field angle is very different from the YIG/Pt bilayer, which should have a sinusoidal dependence. A maximum is even found at around 30° from the surface normal for specific values of NiO thickness and temperature. By modeling the spin structure of NiO under an out-of-plane magnetic field after considering the interplay among the interfacial exchange coupling, the AF easy-plane anisotropy, and the field-induced hard-axis anisotropy in NiO, the main features of the experimental data in the nontrivial angular dependence of the spin pumping in YIG/NiO/Pt trilayers have been reproduced.

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Presenters

  • Yang Cheng

    Ohio State University, Department of Physics, The Ohio State University

Authors

  • Yang Cheng

    Ohio State University, Department of Physics, The Ohio State University

  • Ricardo Zarzuela

    Physics, University of California, Los Angeles, University of California, Los Angeles

  • Jack T Brangham

    Department of Physics, The Ohio State University, Ohio State University

  • Aidan J Lee

    Ohio State University

  • Shane White

    Department of Physics, The Ohio State University, Ohio State University

  • P Chris Hammel

    Ohio State University, Department of Physics, The Ohio State University, Department of Physics, Ohio State University

  • Yaroslav Tserkovnyak

    Univ of California - Los Angeles, Physics, UCLA, Physics, Univ of California - Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles, Physics, University of California, Los Angeles, University of California, Los Angeles

  • Fengyuan Yang

    Ohio State University, Department of Physics, The Ohio State University