Ultrafast spin dynamics in multisublattice magnets.
Phys Rev Lett
; 108(5): 057202, 2012 Feb 03.
Article
em En
| MEDLINE
| ID: mdl-22400955
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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MEDLINE
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article