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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 3: THz, EUV and X-Ray Sources and their Application
K 3.2: Vortrag
Montag, 2. März 2026, 18:00–18:15, HS 20
Coherent small-angle magnetic scattering from a high harmonic generation source — •Konstanze Korell1, Sergey Zayko1, Hung-Tzu Chang1, Timo Schmidt2, Murat Sivis1,3, Manfred Albrecht2, and Claus Ropers1,3 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 2Experimental Physics IV, University of Augsburg, Germany — 34th Physical Institute - Solids and Nanostructures, University of Göttingen, Germany
Ultrafast demagnetization has been widely studied using time-resolved optical spectroscopy as well as soft X-Ray and EUV diffraction. Using a femtosecond high harmonic generation source, we conduct EUV scattering experiments on magnetic nanostructures in a laboratory-based setup. This yields general information about the transient evolution of statistical properties of domain walls. Ultrafast coherent diffractive imaging has recently provided real-space insights [1], limited, however, to reversible dynamics. Here, by carrying out coherent speckle diffraction, we combine the strengths of diffraction with the coherence of a source capable of coherent imaging. This approach provides insights to reversible and irreversible processes. In this contribution I present both the opportunities and limitations providing a basis for the interpretation of nanoscale magnetic dynamics in future ultrafast experiments.
[1] H.-T. Chang et. al, arXiv:2504.17917 (2025)
Keywords: high harmonic generation; small-angle scattering; magnetism; ultrafast dynamics; CoPt thin film