Spin to charge and charge to spin conversion in a Dirac semimetal

ORAL

Abstract

We report evidence of spin to charge and charge to spin conversion at room temperature in thin films of the archetypal three-dimensional Dirac semimetal Cd3As2 grown by molecular beam epitaxy. This has been detected by means of ferromagnetic driven spin pumping (SP) and spin torque ferromagnetic resonance (ST-FMR) in NiFe/Cd3As2 heterostructures. Analysis of the frequency and power dependence of the SP signal and of the symmetric and antisymmetric contributions to the mixing voltage in ST-FMR show that the behavior of these processes is consistent with previously reported spin to charge conversion mechanisms in heavy metals and topological insulators. Finally, we compare the efficiency of these phenomena with the one due to the inverse spin Hall effect in NiFe/Platinum bilayers.

*This work is supported by SMART/nCORE/SRC/NIST, the Institute for Quantum Matter under DOE EFRC grant DE-SC0019331, 2DCC-MIP/NSF DMR-1539916 and the Office of Graduate Educational Equity Programs and Eberly College of Science at The Pennsylvania State University.

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Presenters

  • Wilson Yanez

    • Department of Physics, The Pennsylvania State University
    • Pennsylvania State University
    • Physics, Pennsylvania State University

Authors

  • Wilson Yanez

    • Department of Physics, The Pennsylvania State University
    • Pennsylvania State University
    • Physics, Pennsylvania State University

  • Run Xiao

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Jacob T Held

    • University of Minnesota
    • Chemical Engineering and Materials Science, University of Minnesota

  • Di Xiao

    • Physics, Pennsylvania State University

  • Jeffrey G Rable

    • Physics, Pennsylvania State University

  • Enrique González

    • Physics and Electronics, University of Puerto Rico at Humacao

  • Yongxi Ou

    • Cornell University
    • Physics, Pennsylvania State University

  • Anthony R. Richardella

    • Department of Physics, The Pennsylvania State University
    • Pennsylvania State University
    • Physics, Pennsylvania State University

  • K. Andre Mkhoyan

    • University of Minnesota
    • Chemical Engineering and Materials Science, University of Minnesota

  • Nitin Samarth

    • Penn State University
    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University