Giant Room Temperature Spin Hall Effect in BaPb<sub>1-x</sub>Bi<sub>x</sub>O<sub>3 </sub>Thin Film Heterostructures

ORAL

Abstract

BaPb1-xBixO3 (BPBO) is a superconductor with strong spin-orbit coupling and a Tc of 11K at optimal doping ( x=0.25 ) [1], bounded by metallic BaPbO3 (x=0) and charge density wave insulator BaBiO3 (x=1) in its phase diagram. We study room temperature charge to spin conversion in BPBO/Permalloy thin film heterostructures by spin-torque ferromagnetic resonance, finding a large spin Hall angle in BPBO (x=0.25). The much smaller spin Hall angle we observe in the parent BaPbO3 (x=0) indicates a significant role of Bi in engineering the spintronic properties of this system. This work highlights the potential of BPBO and other phase-competition superconductors for superconducting spintronics.

*This research is funded in part by the Gordon and Betty Moore Foundation's EPiQS Initiative, grant GBMF9065 to C.B.E., Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844). Transport measurement at the UW-Madison was supported by the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), under award number DE-FG02-06ER46327.

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Publication: D.T. Harris et al., Phys. Rev. Materials 2, 041801(R) (2018)

Presenters

  • Anthony L Edgeton

    • University of Wisconsin - Madison

Authors

  • Anthony L Edgeton

    • University of Wisconsin - Madison

  • Michael V Patton

    • University of Wisconsin - Madison

  • Neil G Campbell

    • University of Wisconsin - Madison

  • Yahong Chai

    • Tsinghua University

  • Daniel C Ralph

    • Cornell University

  • Mark S Rzchowski

    • University of Wisconsin - Madison

  • Tianxiang Nan

    • Tsinghua University

  • Chang-Beom Eom

    • University of Wisconsin - Madison
    • Oxide Laboratory, University of Wisconsin - Madison