The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni

Tobias Lojewski*, Mohamed F. Elhanoty, Loïc Le Guyader, Oscar Grånäs, Naman Agarwal, Christine Boeglin, Robert Carley, Andrea Castoldi, Christian David, Carsten Deiter, Florian Döring, Robin Y. Engel, Florian Erdinger, Hans Fangohr, Carlo Fiorini, Peter Fischer, Natalia Gerasimova, Rafael Gort, Frank deGroot, Karsten HansenSteffen Hauf, David Hickin, Manuel Izquierdo, Benjamin E. Van Kuiken, Yaroslav Kvashnin, Charles Henri Lambert, David Lomidze, Stefano Maffessanti, Laurent Mercadier, Giuseppe Mercurio, Piter S. Miedema, Katharina Ollefs, Matthias Pace, Matteo Porro, Javad Rezvani, Benedikt Rösner, Nico Rothenbach, Andrey Samartsev, Andreas Scherz, Justina Schlappa, Christian Stamm, Martin Teichmann, Patrik Thunström, Monica Turcato, Alexander Yaroslavtsev, Jun Zhu, Martin Beye, Heiko Wende, Uwe Bovensiepen, Olle Eriksson, Andrea Eschenlohr*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be captured by electron repopulation respectively correlation-induced modifications of the electronic structure, requiring to take the local Coulomb interaction into account.

Original languageEnglish
Pages (from-to)655-661
Number of pages7
JournalMaterials Research Letters
Volume11
Issue number8
DOIs
Publication statusPublished - 2023

Bibliographical note

Funding Information:
by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–Project-ID 278162697–SFB 1242 is gratefully acknowledged. The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at NSC and Uppmax partially funded by the Swedish Research Council through grant agreement no. 2018-05973. O. G. acknowledges financial support from the Strategic Research Council (SSF) grant ICA16-0037 and the Swedish Research Council (VR) grant 2019-03901. This work was also supported by the European Research Council via Synergy Grant 854843 - FASTCORR. O. E. acknowledges support also from eSSENCE, the Knut and Alice Wallenberg foundation, the Swedish Research Council (VR) and the Foundation for Strategic Research. C.B. was supported by the Region Grand Est [grant number 19P07304 - FEMTOSPIN]. P. S. M., R. Y. E. and M. B. acknowledge funding from the Helmholtz Association [grant number VH-NG-1105]. We acknowledge support by the Open Access Publication Fund of the University of Duisburg-Essen.  The authors acknowledge European XFEL in Schenefeld, Germany, for provision of X -ray free-electron laser beamtime at the SCS instrument and would like to thank the staff for their assistance.

Publisher Copyright:
© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Funding

by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–Project-ID 278162697–SFB 1242 is gratefully acknowledged. The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at NSC and Uppmax partially funded by the Swedish Research Council through grant agreement no. 2018-05973. O. G. acknowledges financial support from the Strategic Research Council (SSF) grant ICA16-0037 and the Swedish Research Council (VR) grant 2019-03901. This work was also supported by the European Research Council via Synergy Grant 854843 - FASTCORR. O. E. acknowledges support also from eSSENCE, the Knut and Alice Wallenberg foundation, the Swedish Research Council (VR) and the Foundation for Strategic Research. C.B. was supported by the Region Grand Est [grant number 19P07304 - FEMTOSPIN]. P. S. M., R. Y. E. and M. B. acknowledge funding from the Helmholtz Association [grant number VH-NG-1105]. We acknowledge support by the Open Access Publication Fund of the University of Duisburg-Essen.  The authors acknowledge European XFEL in Schenefeld, Germany, for provision of X -ray free-electron laser beamtime at the SCS instrument and would like to thank the staff for their assistance.

FundersFunder number
Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)278162697 - SFB 1242
Swedish Research Council2018-05973
Strategic Research Council (SSF)ICA16-0037
Swedish Research Council (VR)2019-03901
European Research Council854843 - FASTCORR
eSSENCE
Knut and Alice Wallenberg foundation
Swedish Research Council (VR)
Foundation for Strategic Research
Region Grand Est19P07304 - FEMTOSPIN
Helmholtz AssociationVH-NG-1105
Open Access Publication Fund of the University of Duisburg-Essen
Swedish Foundation for Strategic Research (SSF)ICA16-0037

    Keywords

    • Ferromagnetism
    • Local correlations
    • Time-dependent density functional theory
    • Time-resolved x-ray absorption spectroscopy
    • Ultrafast dynamics

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