SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.14: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Spectroscopic Analysis of the Ultrafast Non-Equilibrium Dynamics in Nickel at the European X-Ray Free-Electron Laser — •T. Lojewski¹, N. Rothenbach¹, Y. Kvashnin², L. Le Guyader³, B. Van Kuiken³, R. Carley³, J. Schlappa³, R. Gort³, G. Mercurio³, A. Yaroslavtsev³, N. Gerasimova³, M. Teichmann³, L. Mercadier³, R. Y. Engel⁴, P. Miedema⁴, L. Spieker¹, F. Döring⁵, B. Rösner⁵, F. De Groot⁶, P. Thunström², O. Granäs², 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 and CENIDE — ²Uppsala Univ. — ³European XFEL — ⁴DESY — ⁵PSI — ⁶Utrecht Univ. — ⁷ETH Zürich — ⁸ITMO Univ. — ⁹INFN — ¹⁰Univ. of Strasbourg — ¹¹FHNW

X-ray absorption spectroscopy has become a valuable technique to study non-equilibrium dynamics due to its sensitivity to electronic and lattice dynamics combined with its element-specificity. The SCS instrument of the European X-ray free-electron laser offers unprecedented energy resolution and dynamic range in X-ray absorption spectra and their pump-induced changes. We report the time-resolved, spectroscopic analysis at the L _2,3 -edges of nickel-metal obtained in transmission geometry. This spectroscopic analysis was combined with ab initio DFT calculations. We find redshifts and reduced peak intensities of the pumped spectra, which can be related to a reduction of the magnetic moment and an electronic redistribution, respectively.