M. Fanciulli1,2, M. Pancaldi3,4, A. E. Stanciu5, M. Guer1, E. Pedersoli3, D. De Angelis3, P. Rebernik Ribic3, D. Bresteau1, M. Luttmann1, P. Carrara6, A. Ravindran7, B. Rösner8, C. David8, C. Spezzani3, M. Manfredda3, R. Sousa5, L. Vila5, I.-L. Prejbeanu5, L. Buda-Prejbeanu5, B. Dieny5, G. De Ninno3,7, F. Capotondi3, T. Ruchon1, M. Sacchi6,9 1 Lidyl - AttoLab, CEA Saclay, France 2 LPMS - Cergy Paris Université, France 3 Elettra - Sincrotrone Trieste, Italy 4 Università di Ca’ Foscari, Venezia, Italy 5 Spintec, CEA Grenoble, France 6 CNRS – INSP, Sorbonne Université, Paris, France 7 LQO, University of Nova Gorica, Slovenia 8 Paul Scherrer Institut, Villigen, Switzerland 9 Synchrotron SOLEIL, Université Paris-Saclay, France e-mail: maurizio.sacchi@synchrotron-soleil.fr Acknowledgments This work was supported by the Agence Nationale de la Recherche, France, project HELIMAG (n. ANR-21-CE30-0037) and project TORNADO (n. ANR-23-EXLU-0004); the ERC CZ Programme, project TWISTnSHINE (n. LL2314); the Johannes Amos Commenius Programme, project QM4ST (n. CZ.02.01.01/00/22_008/0004572); the Slovenian Research Agency (ARRS), project “Structured light as a tool for triggering and probing new states of matter (n. J1-3012); the Indo-French Centre for the Promotion of Advanced Research, CEFIPRA (n. 7104-3); the EU-H2020, project NFFA (grant n. 6543600; the Italian Ministry of University and Research, PRIN2020 (grant No. 2020PY8KTC); the European COST Action NEXT (grant n. CA22148). Original paper M. Fanciulli et al., Phys. Rev. Lett. 134, 156701 (2025); DOI:10.1103/PhysRevLett.134.156701. Fig. 1 Figure 1. (a) Sketch of the experiment. An IR pulse excites the magnetic vortex. The free-electron laser pulse carrying OAM probes the system at a given delay Δt after the pump pulse. The MHD signal is obtained by subtracting the results of two measurements differing for the sign of the initial curling of the vortex. (b) MHD signal measured at two different delays, before (left, Δt < 0, corresponding to the static vortex configuration) and 13 ps after (right) the IR excitation. The inversion of the color scale corresponds to an inversion of the magnetic vortex curling. (a) (b) Structure and Dynamics Elettra Highlights 2024–2025 87
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