Spin Hall conductivity of polycrystalline TaAs thin films grown by molecular beam epitaxy

ORAL

Abstract

We report the synthesis and characterization of polycrystalline TaAs thin films grown by molecular beam epitaxy. We used transmission electron microscopy, energy-dispersive X-ray spectroscopy and reflection high energy electron diffraction to confirm the polycrystallinity and composition of our films. Furthermore, we combined them with a soft ferromagnet (NiFe) and used spin torque ferromagnetic resonance (ST-FMR) to study the charge to spin conversion in the heterostructure. We performed electrical transport measurements and experimentally determined the spin Hall conductivity of polycrystalline TaAs in the thin film regime. Finally, we compare our results with the charge to spin conversion produced by the spin Hall effect in a NiFe/Ta control sample.

*This project was funded by SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by the National Institute of Standards and Technology (NIST) and the Institute for Quantum Matter, an EFRC funded by the U.S. DOE/BES under Award No. DE-SC0019331.

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Presenters

  • Wilson J Yanez

    • Pennsylvania State University

Authors

  • Wilson J Yanez

    • Pennsylvania State University

  • Yongxi Ou

    • Pennsylvania State University

  • Run Xiao

    • Pennsylvania State University

  • Supriya Ghosh

    • University of Minnesota

  • Jyotirmay Dwivedi

    • Pennsylvania State University

  • Emma Steinebronn

    • Pennsylvania State University

  • K. Andre Mkhoyan

    • University of Minnesota

  • Nitin Samarth

    • Pennsylvania State University