ArticleStructural dynamics (Melville, N.Y.)2026
Ultrafast internal dynamics of chiral domain walls probed by time-resolved x-ray resonant magnetic scattering.
Article in Structural dynamics (Melville, N.Y.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We measure the 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 and recovery together with a weak oscillatory contribution attributed to laser-launched coherent surface phonons. In contrast, the dichroic signal, which is sensitive to the in-plane magnetization within the Néel domain walls, exhibits a pronounced oscillatory response. Interestingly, the observed frequency of domain wall dynamics decreases with increasing pump fluence. We associate this frequency decrease with a transient softening of the domain-wall restoring potential following optical excitation. This finding highlights that time-resolved XRMS isolates internal domain-wall dynamics and provides reciprocal-space access to wall-specific degrees of freedom in disordered stripe textures on picosecond time scales.
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