Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Electron Theory of Magnetism and Correlations
MA 38.2: Vortrag
Freitag, 9. September 2022, 09:45–10:00, H43
Angular momentum transfer via relativistic spin-lattice coupling from first principles — •Hannah Lange1, Sergiy Mankovsky1, Svitlana Polesya1, Markus Weißenhofer2, Ulrich Nowak2, and Hubert Ebert1 — 1Dept. Chemistry, LMU Munich, Butenandtstr. 11, 81377 Munich — 2Dept. Physics, Uni Konstanz, 78457 Konstanz
The transfer and control of angular momentum is a key aspect for spintronic applications. Only recently, it was shown that it is possible to transfer angular momentum from the spin system to the lattice on ultrashort time scales [1]. Hence, combined molecular-spin dynamics simulations using first-principles parameters might give access to the central aspects of the underlying mechanisms.
To contribute to the understanding of angular momentum transfer between spin and lattice degrees of freedom we present a scheme to calculate fully-relativistic spin-lattice coupling parameters from first-principles. By treating changes in the spin configuration and atomic positions at the same level, closed expressions for the atomic spin-lattice coupling parameters can be derived in a coherent manner up to any order. Analyzing the properties of these parameters, in particular their dependence on spin-orbit coupling, we find that even in bcc Fe the leading term for the angular momentum exchange between the spin system and the lattice is a Dzyaloshiskii-Moriya-type interaction, which is due to the symmetry breaking distortion of the lattice.
[1] Tauchert et al. Nature 602, 73 (2022).