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Spin Current from sub-Terahertz-generated Antiferromagnetic Magnons

ORAL

Abstract

Spin dynamics in antiferromagnets offers attractive benefits for potential ultrafast device applications. To date, spin current generation via antiferromagnetic resonance and simultaneous electrical detection by the inverse spin Hall effect in heavy metals have not been explicitly demonstrated. Here we report sub-terahertz spin pumping in heterostructures of a uniaxial antiferromagnetic Cr2O3 crystal and a heavy metal of Pt or Ta (Beta-phase). The magnetic resonances in Cr2O3 are excited both below and above spin flop transitions. Both resonances generate pure spin currents in the heterostructures, which are detected by the heavy metal as an open-circuit voltage peak or dip. The pure spin current nature of the electrically detected signals is unambiguously confirmed by the reversal of voltage polarity under two circumstances: one when switching the detector metal from Pt to Ta which reverses the sign of spin Hall angle, and the other when flipping the magnetic field direction which reverses the magnon chirality.

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Presenters

  • Jing Shi

    University of California, Riverside, Physics and Astronomy, University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside

Authors

  • Junxue Li

    University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside

  • Blake Wilson

    Physics Department and Institute for Terahertz Science and Technology, University of California, Santa Barbara

  • Ran Cheng

    University of California, Riverside

  • Mark I Lohmann

    University of California, Riverside

  • Marzieh Kavand

    Physics Department and Institute for Terahertz Science and Technology, University of California, Santa Barbara

  • Wei Yuan

    University of California, Riverside

  • Mohammed Aldosary

    University of California, Riverside, Physics and Astronomy, University of California, Riverside

  • Nikolay I Agladze

    Physics Department and Institute for Terahertz Science and Technology, University of California, Santa Barbara

  • Peng Wei

    University of California, Riverside, University of California Riverside, Department of Physics and Astronomy, University of California, Riverside

  • Mark S Sherwin

    Physics Department and Institute for Terahertz Science and Technology, University of California, Santa Barbara

  • Jing Shi

    University of California, Riverside, Physics and Astronomy, University of California, Riverside, Department of Physics and Astronomy, University of California, Riverside