Fig. 1 Figure 1. (a) The experimental setup. The magnetic sample is placed in a tilted magnetic field and irradiated by a pair of EUV pump pulses which generate coherent spin waves with wavelengths of 50 – 90 nm. The spin waves cause diffraction of a time-delayed probe pulse, and the diffracted signal is measured by a CCD camera. (b) Examples of CCD images taken at different pump-probe delays. (c) Integrated signal as a function of the pump-probe delay revealing spin wave oscillations. The inset shows the initial dynamics of the signal indicating EUV-induced demagnetization on the femtosecond time scale. (d) Dispersion curves obtained by varying the pump wavelength for two different samples denoted PMA and CMA. This figure is adapted from P.R. Miedaner et al., Sci. Adv. 10, eadp6015 (2024). N S N S θ 2Θ t CCD Camera Diffracted Signal Sample Pump Probe Pump A +k -k C D -4 ps 16 ps 52 ps 72 ps 104 ps 124 ps 0.11o B P.R. Miedaner†1, N. Berndt†1, J. Deschamps1, S. Urazhdin2, N. Khatu3,4,5, D. Fainozzi3, M. Brioschi6,7, P. Carrara6,7‡, R. Cucini7, G. Rossi6,7, S. Wittrock8,9, D. Ksenzov10, R. Mincigrucci3, F. Bencivenga3, L. Foglia3, E. Paltanin3,11, S. Bonetti4,12, D. Engel9, D. Schick9, C. Gutt10, R. Comin13, K.A. Nelson1, A.A. Maznev1* 1 Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, United States 2 Department of Physics, Emory University, Atlanta, Georgia, United States 3 Elettra Sincrotrone Trieste, Basovizza, Italy 4 Department of Molecular Sciences and Nanosystems, Ca’Foscari University of Venice, Venice, Italy 5 European XFEL, Schenefeld, Germany 6 Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy 7 CNR-Istituto Officina dei Materiali, Trieste, Italy 8 Helmholtz-Zentrum Berlin Für Materialien und Energie GmbH, Berlin, Germany 9 Max Born Institute for Nonlinear Optics & Short Pulse Spectroscopy, Berlin, Germany 10 Department Physik, Universität Siegen, Siegen, Germany 11 Department of Physics, Università degli Studi di Trieste, Trieste, Italy 12 Department of Physics, Stockholm University, Stockholm, Sweden 13 Department of Physics, Massachusetts Institute of Technology, Cambridge,MA, United States e-mail: alexei.maznev@gmail.com; miedaner@mit.edu Acknowledgments P.R.M., N.B., J.D, R.Comin., K.A.N, and A.A.M received support from the Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0019126. E. P. acknowledges the funding received from the European Union’s Horizon 2020 research and innovation program under the Maria Skłodowska-Curie Grant Agreement No. 860553. M.B., P.C., R.Cucini. and G.R. received support from Nanoscience Foundry and Fine Analysis (NFFA-MUR Italy Progetti Internazionali). D.K. and C.G. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) projects GU 535/9-1 and KS 62/3-1. S.B. acknowledges support from the Italian Ministry of University and Research, PRIN2020 funding program, Grant No. 2020PY8KTC. S.U. received support from NSF award No. ECCS-2005786. Original paper P.R. Miedaner et al., Sci. Adv. 10, eadp6015 (2024); DOI:10.1126/sciadv.adp6015. Structure and Dynamics Elettra Highlights 2024–2025 91
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