Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS
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arXiv
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| Format: | Preprint |
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2026
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| author | Ksenzov, Dmitriy Capotondi, Flavio Jaouen, Nicolas Gruber, Raphael Cros, Vincent Kläui, Mathias Pancaldi, Matteo Pedersoli, Emanuele Reyren, Nicolas Gutt, Christian |
| author_facet | Ksenzov, Dmitriy Capotondi, Flavio Jaouen, Nicolas Gruber, Raphael Cros, Vincent Kläui, Mathias Pancaldi, Matteo Pedersoli, Emanuele Reyren, Nicolas Gutt, Christian |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2606_02154 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS Ksenzov, Dmitriy Capotondi, Flavio Jaouen, Nicolas Gruber, Raphael Cros, Vincent Kläui, Mathias Pancaldi, Matteo Pedersoli, Emanuele Reyren, Nicolas Gutt, Christian Optics Mesoscale and Nanoscale Physics 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. |
| title | Ultrafast internal dynamics of chiral domain walls probed by time-resolved XRMS |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2606.02154 |