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PreprintCC BY-NC-ND 4.0arXiv

Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS

  • Dmitriy Ksenzov
  • Flavio Capotondi
  • Nicolas Jaouen
  • Raphael Gruber
  • Vincent Cros
  • Mathias Kläui
  • Matteo Pancaldi
  • Emanuele Pedersoli
  • Nicolas Reyren
  • Christian Gutt
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Abstract

We measure picosecond dynamics of labyrinthine stripe domains with chiral Néel-type domain walls using time-resolved x-ray resonant magnetic scattering (XRMS). At the stripe-domain wavevector, the helicity-summed signal shows ultrafast demagnetization, recovery, and a weak oscillatory contribution that we identify as a signature of laser-launched coherent surface phonons. In contrast, the dichroic signal, which is sensitive to the in-plane magnetization inside the Néel walls, shows a strong oscillatory response whose frequency decreases with increasing pump fluence. We attribute this softening to pump-induced changes in the effective anisotropy and saturation magnetization, which modify the restoring field of an internal domain-wall mode. Time-resolved XRMS thus isolates wall-specific dynamics and provides access to internal domain-wall motion in disordered stripe textures on picosecond time scales.

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Cite

BibTeXRIS
BibTeX
@misc{ksenzov2026ultrafast,
  title = {{Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS}},
  author = {Dmitriy Ksenzov and Flavio Capotondi and Nicolas Jaouen and Raphael Gruber and Vincent Cros and Mathias Kläui and Matteo Pancaldi and Emanuele Pedersoli and Nicolas Reyren and Christian Gutt},
  howpublished = {arXiv},
  year = {2026},
  month = jun,
  doi = {10.48550/arxiv.2606.02154},
  eprint = {2606.02154},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.02154},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS
AU  - Dmitriy Ksenzov
AU  - Flavio Capotondi
AU  - Nicolas Jaouen
AU  - Raphael Gruber
AU  - Vincent Cros
AU  - Mathias Kläui
AU  - Matteo Pancaldi
AU  - Emanuele Pedersoli
AU  - Nicolas Reyren
AU  - Christian Gutt
PY  - 2026
DA  - 2026/06/01
PB  - arXiv
DO  - 10.48550/arxiv.2606.02154
UR  - https://arxiv.org/abs/2606.02154
AB  - We measure picosecond dynamics of labyrinthine stripe domains with chiral Néel-type domain walls using time-resolved x-ray resonant magnetic scattering (XRMS). At the stripe-domain wavevector, the helicity-summed signal shows ultrafast demagnetization, recovery, and a weak oscillatory contribution that we identify as a signature of laser-launched coherent surface phonons. In contrast, the dichroic signal, which is sensitive to the in-plane magnetization inside the Néel walls, shows a strong oscillatory response whose frequency decreases with increasing pump fluence. We attribute this softening to pump-induced changes in the effective anisotropy and saturation magnetization, which modify the restoring field of an internal domain-wall mode. Time-resolved XRMS thus isolates wall-specific dynamics and provides access to internal domain-wall motion in disordered stripe textures on picosecond time scales.
ER  -