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Ultrafast Spin Dynamics in Multisublattice Magnets
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 5, 057202- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 108, no 5, 057202- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-169960DOI: 10.1103/PhysRevLett.108.057202ISI: 000299830500012OAI: oai:DiVA.org:uu-169960DiVA: diva2:508417
Available from: 2012-03-08 Created: 2012-03-07 Last updated: 2012-03-08Bibliographically approved

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