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Disparate ultrafast dynamics of itinerant and localized magnetic moments in gadolinium metal
Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany.;Max Born Inst, D-12489 Berlin, Germany..
Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany.;Max Born Inst, D-12489 Berlin, Germany..
Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany.;Max Born Inst, D-12489 Berlin, Germany..
Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany.;Max Born Inst, D-12489 Berlin, Germany..
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2015 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 6, 8262Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 6, 8262
National Category
Physical Sciences
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URN: urn:nbn:se:uu:diva-266725DOI: 10.1038/ncomms9262ISI: 000363018000002PubMedID: 26355196OAI: oai:DiVA.org:uu-266725DiVA: diva2:868420
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Swedish Research Council
Available from: 2015-11-10 Created: 2015-11-10 Last updated: 2017-12-01Bibliographically approved

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Carva, KarelOppeneer, Peter M.

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