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Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 25: Ultrafast Magnetization Effects 2

MA 25.4: Talk

Wednesday, September 7, 2022, 15:45–16:00, H43

Spectroscopic Analysis of the Ultrafast Non-Equilibrium Dynamics in Nickel at the European X-Ray Free-Electron Laser — •T. Lojewski1, M. F. Elhanoty2, N. Rothenbach1, Y. Kvashnin2, L. Le Guyader3, B. Van Kuiken3, R. Carley3, J. Schlappa3, R. Gort3, G. Mercurio3, A. Yaroslavtsev2,3, N. Gerasimova3, M. Teichmann3, L. Mercadier3, R. Y. Engel4, P. Miedema4, L. Spieker1, F. Döring5, B. Rösner5, F. De Groot6, P. Thunström2, O. Grånäs2, J. Jönsson2, C. Lambert7, I. Pronin8, J. Rezvani9, M. Pace10, C. Boeglin10, C. Stamm7,11, M. Beye4, C. David5, O. Eriksson2, A. Scherz3, U. Bovensiepen1, H. Wende1, K. Ollefs1, and A. Eschenlohr11Univ. Duisburg-Essen — 2Uppsala Univ. — 3European XFEL — 4DESY — 5PSI — 6Utrecht Univ. — 7ETH Zürich — 8ITMO Univ. — 9INFN — 10Univ. of Strasbourg — 11FHNW

X-ray absorption spectroscopy is a powerful technique to investigate non-equilibrium dynamics combining a sensitivity to electron and lattice dynamics with element specificity. We report the time-resolved, spectroscopic analysis of Nickel-metal L 2,3 -edge X-ray absorption spectra and their pump-induced changes measured at the SCS instrument of the European XFEL with unprecedented energy resolution and dynamic range. In addition, ab initio DFT and TD-DFT calculations connect the pump-induced changes to modifications of the electronic DOS. We find pump-induced redshifts and reduced absorption at the L 2,3 -edges, which we explain by a loss of magnetic moment, changes in the electronic correlations and redistribution of electron population.

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