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Ultrafast time-evolution of chiral Néel magnetic domain walls probed by circular dichroism in x-ray resonant magnetic scattering

Author

Listed:
  • Cyril Léveillé

    (Synchrotron SOLEIL, Saint-Aubin, Boite Postale 48)

  • Erick Burgos-Parra

    (Synchrotron SOLEIL, Saint-Aubin, Boite Postale 48
    Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay)

  • Yanis Sassi

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

  • Fernando Ajejas

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

  • Valentin Chardonnet

    (Sorbonne Université, CNRS, Laboratoire Chimie Physique – Matière et Rayonnement, LCPMR)

  • Emanuele Pedersoli

    (Elettra-Sincrotrone Trieste, 34149 Basovizza)

  • Flavio Capotondi

    (Elettra-Sincrotrone Trieste, 34149 Basovizza)

  • Giovanni Ninno

    (Elettra-Sincrotrone Trieste, 34149 Basovizza
    University of Nova Gorica)

  • Francesco Maccherozzi

    (Diamond Light Source)

  • Sarnjeet Dhesi

    (Diamond Light Source)

  • David M. Burn

    (Diamond Light Source)

  • Gerrit Laan

    (Diamond Light Source)

  • Oliver S. Latcham

    (University of Exeter, Stocker road)

  • Andrey V. Shytov

    (University of Exeter, Stocker road)

  • Volodymyr V. Kruglyak

    (University of Exeter, Stocker road)

  • Emmanuelle Jal

    (Sorbonne Université, CNRS, Laboratoire Chimie Physique – Matière et Rayonnement, LCPMR)

  • Vincent Cros

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

  • Jean-Yves Chauleau

    (SPEC, CEA, CNRS, Université Paris-Saclay)

  • Nicolas Reyren

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

  • Michel Viret

    (SPEC, CEA, CNRS, Université Paris-Saclay)

  • Nicolas Jaouen

    (Synchrotron SOLEIL, Saint-Aubin, Boite Postale 48)

Abstract

Non-collinear spin textures in ferromagnetic ultrathin films are attracting a renewed interest fueled by possible fine engineering of several magnetic interactions, notably the interfacial Dzyaloshinskii-Moriya interaction. This allows for the stabilization of complex chiral spin textures such as chiral magnetic domain walls (DWs), spin spirals, and magnetic skyrmions among others. We report here on the behavior of chiral DWs at ultrashort timescale after optical pumping in perpendicularly magnetized asymmetric multilayers. The magnetization dynamics is probed using time-resolved circular dichroism in x-ray resonant magnetic scattering (CD-XRMS). We observe a picosecond transient reduction of the CD-XRMS, which is attributed to the spin current-induced coherent and incoherent torques within the continuously varying spin texture of the DWs. We argue that a specific demagnetization of the inner structure of the DW induces a flow of spins from the interior of the neighboring magnetic domains. We identify this time-varying change of the DW texture shortly after the laser pulse as a distortion of the homochiral Néel shape toward a transient mixed Bloch-Néel-Bloch texture along a direction transverse to the DW.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28899-0
    DOI: 10.1038/s41467-022-28899-0
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    References listed on IDEAS

    as
    1. 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.
    2. S. L. Zhang & G. van der Laan & T. Hesjedal, 2017. "Direct experimental determination of the topological winding number of skyrmions in Cu2OSeO3," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    3. Florian Siegrist & Julia A. Gessner & Marcus Ossiander & Christian Denker & Yi-Ping Chang & Malte C. Schröder & Alexander Guggenmos & Yang Cui & Jakob Walowski & Ulrike Martens & J. K. Dewhurst & Ulf , 2019. "Light-wave dynamic control of magnetism," Nature, Nature, vol. 571(7764), pages 240-244, July.
    4. B. Pfau & S. Schaffert & L. Müller & C. Gutt & A. Al-Shemmary & F. Büttner & R. Delaunay & S. Düsterer & S. Flewett & R. Frömter & J. Geilhufe & E. Guehrs & C.M. Günther & R. Hawaldar & M. Hille & N. , 2012. "Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
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