Disparate ultrafast dynamics of itinerant and localized magnetic moments in gadolinium metal

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2015
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Frietsch, Björn
Bowlan, John
Carley, Robert
Teichmann, Martin
Carva, Karel
Oppeneer, Peter M.
Weinelt, Martin
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Nature Communications. 2015, 6, 8262. eISSN 2041-1723. Available under: doi: 10.1038/ncomms9262
Zusammenfassung

The Heisenberg-Dirac intra-atomic exchange coupling is responsible for the formation of the atomic spin moment and thus the strongest interaction in magnetism. Therefore, it is generally assumed that intra-atomic exchange leads to a quasi-instantaneous aligning process in the magnetic moment dynamics of spins in separate, on-site atomic orbitals. Following ultrashort optical excitation of gadolinium metal, we concurrently record in photoemission the 4f magnetic linear dichroism and 5d exchange splitting. Their dynamics differ by one order of magnitude, with decay constants of 14 versus 0.8 ps, respectively. Spin dynamics simulations based on an orbital-resolved Heisenberg Hamiltonian combined with first-principles calculations explain the particular dynamics of 5d and 4f spin moments well, and corroborate that the 5d exchange splitting traces closely the 5d spin-moment dynamics. Thus gadolinium shows disparate dynamics of the localized 4f and the itinerant 5d spin moments, demonstrating a breakdown of their intra-atomic exchange alignment on a picosecond timescale.

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530 Physik
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Physical sciences, Applied physics, Condensed matter
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ISO 690FRIETSCH, Björn, John BOWLAN, Robert CARLEY, Martin TEICHMANN, Sönke WIENHOLDT, Denise HINZKE, Ulrich NOWAK, Karel CARVA, Peter M. OPPENEER, Martin WEINELT, 2015. Disparate ultrafast dynamics of itinerant and localized magnetic moments in gadolinium metal. In: Nature Communications. 2015, 6, 8262. eISSN 2041-1723. Available under: doi: 10.1038/ncomms9262
BibTex
@article{Frietsch2015-09-10Dispa-33300,
  year={2015},
  doi={10.1038/ncomms9262},
  title={Disparate ultrafast dynamics of itinerant and localized magnetic moments in gadolinium metal},
  volume={6},
  journal={Nature Communications},
  author={Frietsch, Björn and Bowlan, John and Carley, Robert and Teichmann, Martin and Wienholdt, Sönke and Hinzke, Denise and Nowak, Ulrich and Carva, Karel and Oppeneer, Peter M. and Weinelt, Martin},
  note={Article Number: 8262}
}
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