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- Mentink, J. H. (author)
Ultrafast Spin Dynamics in Multisublattice Magnets
- Article/chapterEnglish2012
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- 2012
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-169960
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169960URI
- https://doi.org/10.1103/PhysRevLett.108.057202DOI
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- Language:English
- Summary in:English
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- We propose a general theoretical framework for ultrafast laser-induced spin dynamics in multisublattice magnets. We distinguish relaxation of relativistic and exchange origin and show that when the former dominates, nonequivalent sublattices have distinct dynamics despite their strong exchange coupling. Even more interesting, in the exchange dominated regime sublattices can show highly counterintuitive transitions between parallel and antiparallel alignment. This allows us to explain recent experiments with antiferromagnetically coupled sublattices, and predict that such transitions are possible with ferromagnetic coupling as well. In addition, we predict that exchange relaxation enhances the demagnetization speed of both sublattices only when they are antiferromagnetically coupled.
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- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
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- Hellsvik, JohanUppsala universitet,Materialteori(Swepub:uu)johel021 (author)
- Afanasiev, D. V. (author)
- Ivanov, B. A. (author)
- Kirilyuk, A. (author)
- Kimel, A. V. (author)
- Eriksson, OlleUppsala universitet,Materialteori(Swepub:uu)olleerik (author)
- Katsnelson, M. I. (author)
- Rasing, Th. (author)
- Uppsala universitetMaterialteori (creator_code:org_t)
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- In:Physical Review Letters108:5, s. 057202-0031-90071079-7114
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