SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects I

MA 8.5: Vortrag

Montag, 27. März 2023, 16:15–16:30, HSZ 04

Investigating the interplay of local electron correlations and ultrafast spin dynamics in fcc Ni at the European XFEL — •Tobias Lojewski — University of Duisburg-Essen

The interplay between exchange interaction, electron hopping and local Coulomb repulsion is of great interest as it influences the magnetic order in the 3d transition metals. We report the investigation of the electronic structure in fcc Nickel on the time scale of these interactions by combining the femtosecond time-resolved spectroscopic analysis of Nickel X-ray absorption spectra, measured at the SCS instrument of the European XFEL, with ab initio TD-DFT. We find a transient broadening and redshift of the L _2,3 -edge absorption spectra, which we relate to electron repopulation and correlation-induced electronic structure modifications, demonstrating a time-dependent interaction between band formation, exchange interaction and Coulomb repulsion.
[1] T. Lojewski, M. F. Elhanoty, L. Le Guyader, O. Grånäs, N. Agarwal, C. Boeglin, R. Carley, A. Castoldi, C. David, C. Deiter, F. Döring, R. Y. Engel, F. Erdinger, H. Fangohr, C. Fiorini, P. Fischer, N. Gerasimova, R. Gort, F. de Groot, K. Hansen, S. Hauf, D. Hickin, M. Izquierdo, B. E. Van Kuiken, Y. Kvashnin, C. H. Lambert, D. Lomidze, S. Maffessanti, L. Mercadier, G. Mercurio, P. S. Miedema, K. Ollefs, M. Pace, M. Porro, J. Rezvani, B. Rösner, N. Rothenbach, A. Samartsev, A. Scherz, J. Schlappa, C. Stamm, M. Teichmann, P. Thunstrom, M. Turcato, A. Yaroslavtsev, J. Zhu, M. Beye, H. Wende, U. Bovensiepen, O. Eriksson and A. Eschenlohr, arXiv:2210.13162.