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. Yaroslavtsev^2,3, 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. Stamm^7,11, M. Beye⁴, C. David⁵, O. Eriksson², A. Scherz³, U. Bovensiepen¹, H. Wende¹, K. Ollefs¹, and A. Eschenlohr¹ — ¹Univ. 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.