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Faster chiral versus collinear magnetic order recovery after optical excitation revealed by femtosecond XUV scattering

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  • Nico Kerber

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz)

  • Dmitriy Ksenzov

    (Universität Siegen)

  • Frank Freimuth

    (Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA)

  • Flavio Capotondi

    (Elettra-Sincrotrone Trieste)

  • Emanuele Pedersoli

    (Elettra-Sincrotrone Trieste)

  • Ignacio Lopez-Quintas

    (Elettra-Sincrotrone Trieste)

  • Boris Seng

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz
    Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine)

  • Joel Cramer

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz)

  • Kai Litzius

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz)

  • Daniel Lacour

    (Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine)

  • Hartmut Zabel

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz
    Ruhr-University Bochum)

  • Yuriy Mokrousov

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz
    Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA)

  • Mathias Kläui

    (Institut für Physik, Johannes Gutenberg-Universität Mainz
    Graduate School of Excellence Materials Science in Mainz)

  • Christian Gutt

    (Universität Siegen)

Abstract

While chiral spin structures stabilized by Dzyaloshinskii-Moriya interaction (DMI) are candidates as novel information carriers, their dynamics on the fs-ps timescale is little known. Since with the bulk Heisenberg exchange and the interfacial DMI two distinct exchange mechanisms are at play, the ultrafast dynamics of the chiral order needs to be ascertained and compared to the dynamics of the conventional collinear order. Using an XUV free-electron laser we determine the fs-ps temporal evolution of the chiral order in domain walls in a magnetic thin film sample by an IR pump - X-ray magnetic scattering probe experiment. Upon demagnetization we observe that the dichroic (CL-CR) signal connected with the chiral order correlator mzmx in the domain walls recovers significantly faster than the (CL + CR) sum signal representing the average collinear domain magnetization mz2 + mx2. We explore possible explanations based on spin structure dynamics and reduced transversal magnetization fluctuations inside the domain walls and find that the latter can explain the experimental data leading to different dynamics for collinear magnetic order and chiral magnetic order.

Suggested Citation

  • Nico Kerber & Dmitriy Ksenzov & Frank Freimuth & Flavio Capotondi & Emanuele Pedersoli & Ignacio Lopez-Quintas & Boris Seng & Joel Cramer & Kai Litzius & Daniel Lacour & Hartmut Zabel & Yuriy Mokrouso, 2020. "Faster chiral versus collinear magnetic order recovery after optical excitation revealed by femtosecond XUV scattering," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19613-z
    DOI: 10.1038/s41467-020-19613-z
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    Cited by:

    1. Cyril Léveillé & Erick Burgos-Parra & Yanis Sassi & Fernando Ajejas & Valentin Chardonnet & Emanuele Pedersoli & Flavio Capotondi & Giovanni Ninno & Francesco Maccherozzi & Sarnjeet Dhesi & David M. B, 2022. "Ultrafast time-evolution of chiral Néel magnetic domain walls probed by circular dichroism in x-ray resonant magnetic scattering," Nature Communications, Nature, vol. 13(1), pages 1-6, December.

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