Current-induced unidirectional magnetoresistance in FeRh/Pt bilayers

ORAL

Abstract

Antiferromagnetic (AFM) spin-orbit torque oscillators are important due to potential applications ranging from magnetic random-access memory to THz emitters. However, AFM spin-torque oscillators operate in the THz-range, and direct observation of THz magnetization dynamics is difficult. Previously, in ferromagnetic spin-torque oscillators, current-induced unidirectional magnetoresistance (UMR) signals accompanied the emission of microwave radiation at the ferromagnetic resonance frequency [1,2], which implies that observations of UMR may provide indirect evidence of AFM-resonance. Here we present transport results on magnetron sputtered AFM FeRh/Pt films, fabricated into nanowire geometries. A current-induced UMR is observed, in addition to anisotropic magnetoresistance effects. These findings suggest a route toward designing AFM spin-orbit torque oscillators.
[1] Langenfeld et al. Appl. Phys. Lett. 108, 192402 (2016)
[2] Yasuda et al. Phys. Rev. Lett. 117, 127202 (2016)

*This work was undertaken as part of the Illinois Materials Research Science and Engineering Center, supported by the National Science Foundation MRSEC program under NSF award number DMR-1720633. Sample growth was supported by the Department of Energy, Office of Science, Materials Science and Engineering Division.

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Presenters

  • Julie Shim

    • Physics, University of Illinois at Urbana-Champaign

Authors

  • Julie Shim

    • Physics, University of Illinois at Urbana-Champaign

  • Hilal Saglam

    • Applied Physics, Yale University
    • Materials Science Division, Argonne National Laboratory

  • Kisung Kang

    • University of Illinois Urbana-Champaign
    • Materials Science and Engineering, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Junseok Oh

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

  • Yi Li

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory
    • Argonne Natl Lab

  • Wei Zhang

    • Oakland University
    • Physics, Oakland University
    • Department of Physics, Oakland University
    • Electronic and Computer Engineering, Oakland University

  • Matthew Gilbert

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

  • Andre Schleife

    • University of Illinois Urbana-Champaign
    • Materials Science and Engineering, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Axel Hoffmann

    • University of Illinois
    • Materials Science and Engineering, University of Illinois at Urbana Champaign
    • Argonne National Laboratory
    • University of Illinois Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Materials Science and Engineering, University of Illinois at Urbana-Champaign
    • Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign
    • Materials Science Division, Argonne National Laboratory
    • Argonne Natl Lab

  • Joseph Sklenar

    • Wayne State Univ
    • Wayne State University
    • Physics and Astronomy, Wayne State University

  • Nadya Mason

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