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Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions

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  • E. Rongione

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay
    Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité)

  • O. Gueckstock

    (Institute of Physics, Freie Universität Berlin)

  • M. Mattern

    (Institut für Physik und Astronomie, Universität Potsdam)

  • O. Gomonay

    (Institute of Physics, Johannes Gutenberg-University Mainz)

  • H. Meer

    (Institute of Physics, Johannes Gutenberg-University Mainz)

  • C. Schmitt

    (Institute of Physics, Johannes Gutenberg-University Mainz)

  • R. Ramos

    (Tohoku University
    Centro Singular de Investigación en Química Bilóxica e Materiais Moleculares (CIQUS), Departamento de Química-Física, Universidade de Santiago de Compostela)

  • T. Kikkawa

    (The University of Tokyo)

  • M. Mičica

    (Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité)

  • E. Saitoh

    (Tohoku University
    The University of Tokyo
    The University of Tokyo)

  • J. Sinova

    (Institute of Physics, Johannes Gutenberg-University Mainz)

  • H. Jaffrès

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • J. Mangeney

    (Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité)

  • S. T. B. Goennenwein

    (University of Konstanz)

  • S. Geprägs

    (Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften)

  • T. Kampfrath

    (Institute of Physics, Freie Universität Berlin)

  • M. Kläui

    (Institute of Physics, Johannes Gutenberg-University Mainz
    Graduate School of Excellence Materials Science in Mainz (MAINZ)
    Norwegian University of Science and Technology)

  • M. Bargheer

    (Institut für Physik und Astronomie, Universität Potsdam
    Helmholtz-Zentrum Berlin für Materialien und Energie, Wilhelm-Conrad-Röntgen Campus, BESSY II)

  • T. S. Seifert

    (Institute of Physics, Freie Universität Berlin)

  • S. Dhillon

    (Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité)

  • R. Lebrun

    (Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

Abstract

Antiferromagnetic materials have been proposed as new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Manipulating coherently their spin dynamics, however, remains a key challenge that is envisioned to be accomplished by spin-orbit torques or direct optical excitations. Here, we demonstrate the combined generation of broadband THz (incoherent) magnons and narrowband (coherent) magnons at 1 THz in low damping thin films of NiO/Pt. We evidence, experimentally and through modeling, two excitation processes of spin dynamics in NiO: an off-resonant instantaneous optical spin torque in (111) oriented films and a strain-wave-induced THz torque induced by ultrafast Pt excitation in (001) oriented films. Both phenomena lead to the emission of a THz signal through the inverse spin Hall effect in the adjacent heavy metal layer. We unravel the characteristic timescales of the two excitation processes found to be 300 fs, respectively, and thus open new routes towards the development of fast opto-spintronic devices based on antiferromagnetic materials.

Suggested Citation

  • E. Rongione & O. Gueckstock & M. Mattern & O. Gomonay & H. Meer & C. Schmitt & R. Ramos & T. Kikkawa & M. Mičica & E. Saitoh & J. Sinova & H. Jaffrès & J. Mangeney & S. T. B. Goennenwein & S. Geprägs , 2023. "Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37509-6
    DOI: 10.1038/s41467-023-37509-6
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    References listed on IDEAS

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    1. Lin Huang & Yanzhang Cao & Hongsong Qiu & Hua Bai & Liyang Liao & Chong Chen & Lei Han & Feng Pan & Biaobing Jin & Cheng Song, 2024. "Terahertz oscillation driven by optical spin-orbit torque," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
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