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Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Author

Listed:
  • Jianyu Zhang

    (Beihang University)

  • Mingfeng Chen

    (Tsinghua University)

  • Jilei Chen

    (Beihang University
    Southern University of Science and Technology)

  • Kei Yamamoto

    (Advanced Science Research Center, Japan Atomic Energy Agency
    RIKEN Center for Emergent Matter Science, Wako)

  • Hanchen Wang

    (Beihang University)

  • Mohammad Hamdi

    (Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL))

  • Yuanwei Sun

    (Peking University)

  • Kai Wagner

    (University of Basel)

  • Wenqing He

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Yu Zhang

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Ji Ma

    (Tsinghua University)

  • Peng Gao

    (Peking University)

  • Xiufeng Han

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Dapeng Yu

    (Southern University of Science and Technology)

  • Patrick Maletinsky

    (University of Basel)

  • Jean-Philippe Ansermet

    (Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL))

  • Sadamichi Maekawa

    (RIKEN Center for Emergent Matter Science, Wako
    University of Chinese Academy of Sciences)

  • Dirk Grundler

    (Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL)
    Institute of Electrical and Micro Engineering, École Polytechnique Fédérale de Lausanne (EPFL))

  • Ce-Wen Nan

    (Tsinghua University)

  • Haiming Yu

    (Beihang University)

Abstract

Magnons can transfer information in metals and insulators without Joule heating, and therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is typically on the tens of micrometre length scale. Here, we demonstrate an ultra-long magnon decay length of up to one millimetre in multiferroic/ferromagnetic BiFeO3(BFO)/La0.67Sr0.33MnO3(LSMO) heterostructures at room temperature. This decay length is attributed to a magnon-phonon hybridization and is more than two orders of magnitude longer than that of bare metallic LSMO. The long-distance modes have high group velocities of 2.5 km s−1 as detected by time-resolved Brillouin light scattering. Numerical simulations suggest that magnetoelastic coupling via the BFO/LSMO interface hybridizes phonons in BFO with magnons in LSMO to form magnon-polarons. Our results provide a solution to the long-standing issue on magnon decay lengths in metallic magnets and advance the bourgeoning field of hybrid magnonics.

Suggested Citation

  • Jianyu Zhang & Mingfeng Chen & Jilei Chen & Kei Yamamoto & Hanchen Wang & Mohammad Hamdi & Yuanwei Sun & Kai Wagner & Wenqing He & Yu Zhang & Ji Ma & Peng Gao & Xiufeng Han & Dapeng Yu & Patrick Malet, 2021. "Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27405-2
    DOI: 10.1038/s41467-021-27405-2
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