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  Impact of electron correlation on the light-induced demagnetization of elemental ferromagnetic metals

Barros, T., Tancogne-Dejean, N., Berakdar, J., & Marques, M. A. L. (2022). Impact of electron correlation on the light-induced demagnetization of elemental ferromagnetic metals. European Physical Journal B, 95(10): 175. doi:10.1140/epjb/s10051-022-00433-7.

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s10051-022-00433-7.pdf (Publisher version), 894KB
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 Creators:
Barros, T.1, Author
Tancogne-Dejean, N.2, 3, Author           
Berakdar, J.1, Author
Marques, M. A. L.1, Author
Affiliations:
1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Center for Free-Electron Laser Science, ou_persistent22              

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 Abstract: The local spin-density approximation (LSDA) is known to describe poorly the electronic structure of 3d transition metals, yet most density-functional-based ab-initio studies of ultra-fast demagnetization rely on it. One way to account for Coulomb correlations among the localized d electrons and go beyond LSDA is to include the effective correlation energy (or Hubbard) U. By doing so, we show here that electronic correlations lead to sizable changes of the laser-induced demagnetization of iron, cobalt, and nickel. We study how the various laser parameters, such as pulse duration or intensity, change the magnetization dynamics. It turns out that the total laser fluence is not suitable to quantify how much a laser pulse demagnetizes a material, as changes in pulse duration and shape influence significantly the outcome. The findings are traced back to the electronic structure of the material, and explained based on phase space for optical transitions.

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Language(s): eng - English
 Dates: 2022-07-132022-10-072022-10-262022-10
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1140/epjb/s10051-022-00433-7
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Project name : Open Access funding enabled and organized by Projekt DEAL.
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Title: European Physical Journal B
  Other : Eur. Phys. J. B
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag Heidelberg
Pages: - Volume / Issue: 95 (10) Sequence Number: 175 Start / End Page: - Identifier: ISSN: 1434-6028
CoNE: https://pure.mpg.de/cone/journals/resource/954927001233