Anisotropic and spin Hall magnetoresistance in FeRh/Pt bilayers

ORAL

Abstract

We have sputtered epitaxial films of BCC FeRh with thicknesses between 7.5-35 nm on (100) MgO, capped with 5-nm Pt. Magnetometry and magnetotransport measurements indicate a first-order transition from ferromagnetic to antiferromagnetic order below room temperature. We have structured lithographically the films into Hall bars and nano-wires, such that the current is directed along different crystalline orientations. The angular-dependent magnetoresistance of all devices is measured in both the ferromagnetic and antiferromagnetic phase, and there is evidence for both intrinsic anisotropic magnetoresistance as well as spin Hall magnetoresistance contributing to the measured signal. In the antiferromagnetic phase we measure drastically different angular signals depending on whether the current is along the (100) or (110) direction.

*Work at The University of Illinois at Urbana-Champaign was supported by the National Science Foundation MRSEC program under NSF award number DMR-1720633. Work at Argonne was supported by the U.S. Department of Energy, Office of Science, Materials Sciences and Engineering Division.

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Presenters

  • Joseph Sklenar

    • Department of Physics, University of Illinois at Urbana Champaign
    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign

Authors

  • Joseph Sklenar

    • Department of Physics, University of Illinois at Urbana Champaign
    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign

  • Hilal Saglam

    • Materials Science Division, Argonne National Laboratory

  • Junseok Oh

    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign

  • Greg Hamilton

    • University of Illinois at Urbana-Champaign

  • Yi Li

    • Materials Science Division, Argonne National Laboratory

  • Wei Zhang

    • Department of Physics, Oakland University
    • Oakland University

  • Matthew Gilbert

    • University of Illinois at Urbana-Champaign
    • Electrical and Computer Engineering, University of Illinois at Urbana-Champaign

  • Axel F Hoffmann

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory
    • Materials Science Division, ARGONNE NATIONAL LABORATORY
    • Argonne National Lab

  • Nadya Mason

    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign