Spin-current across the metamagnetic transition in FeRh films as measured with THz emission spectroscopy

ORAL

Abstract

THz emission from heterostructures of ferromagnetic (FM) and noble metal (NM) layers is attributed to spin-charge conversion at the FM/NM interface, yet similar effects in bare magnetic thin films are not fully understood. Here we perform THz emission spectroscopy on thin films of FeRh, which is well known to undergo an antiferromagnetic to ferromagnetic phase transition around room temperature. The emitted THz field is observed to have a strong temperature dependence and a power-law dependence on the incident pump pulse fluence. Combined with the knowledge of the spin Hall angle, we extract a temperature dependent spin current across the metamagnetic transition.

*This work is supported by the Illinois Materials Research Science and Engineering Centers (MRSEC) award number DMR-1720633 and through the Illinois Materials Research Lab (MRL) facilities. Film growth is supported DOE, Office of Science, Materials Science and Engineering Division.

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Presenters

  • Yinchuan Lv

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

Authors

  • Yinchuan Lv

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

  • Hilal Saglam

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

  • Soho shim

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

  • Jonathan Gibbons

    • Material Science and Engineering, University of Illinois at Urbana-Champaign
    • Materials Science and Engineering, University of Illinois, Urbana-Champaign, Materials Science, Argonne National Laboratory, Physics, University of California, San Diego
    • Materials Science and Engineering, University of Illinois at Urbana-Champaign

  • Axel F Hoffmann

    • University of Illinois at Urbana-Champaign
    • Material Science and Engineering, University of Illinois at Urbana-Champaign
    • Materials Science and Engineering, University of Illinois, Urbana-Champaign
    • Argonne National Laboratory
    • Materials Science and Engineering, University of Illinois at Urbana-Champaign

  • Nadya Mason

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

  • Fahad Mahmood

    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign
    • Material Science and Engineering, University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign