Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.16: Poster
Monday, March 9, 2026, 09:30–12:30, P2
Ultrafast Rearrangement of Antiferromagnetic Spin order Probed with Femtosecond X-ray Diffraction — •Yoav William Windsor1,2, Sang-Eun Lee1, Daniela Zahn1, Kristin Kliemt3, Christian Schüßler-Langeheine4, Niko Pontius4, Denis Vyalikh5, Urs Staub6, Cornelius Krellner3, and Laurenz Rettig1 — 1Fritz Haber Institute der MPG, DE — 2TU Berlin, DE — 3Goethe-Universität Frankfurt, DE — 4Helmholtz-Zentrum Berlin, DE — 5DIPC, San Sebastián, ES — 6Paul Scherrer Institut, Villigen, CH
Ultrafast spin manipulation carries great potential for future information technology. In particular, antiferromagnets offer the prospect of faster and more efficient spin dynamics, as well as exploitable magnetic properties that are unavailable in ferromagnets. One example is the internal arrangement of spins. Controlling this can alter how the antiferromagnet stores data, interacts with neighboring materials, etc.
Here we demonstrate manipulation of the spin structure in LnRh2Si2 (Ln = Ho, Dy; see also [1-3]) by means of femtosecond optical excitation. We probe the transient spin arrangement using femtosecond resonant X-ray diffraction tuned to the Ln ions’ M4,5 edges ("soft X-rays"). By probing the azimuthal dependence of the transient magnetic Bragg intensity, we disentangle the ultrafast rearrangement of the spin order from ultrafast demagnetization.
1. Windsor et al., Communications Physics 3, 139 (2020)
2. Windsor et al., Nature Materials 21, 514-517 (2022)
3. Lee et al., Phys. Rev. Research 6, 043019 (2024)
Keywords: ultrafast; antiferromagnet; resonant X-ray diffraction