Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 63: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons I (joint session MA/TT)
TT 63.5: Hauptvortrag
Donnerstag, 21. März 2024, 11:45–12:15, H 1058
Spin-lattice coupling in multiscale modeling — •Markus Weißenhofer1,2, Sergiy Mankovsky3, Svitlana Polesya3, Hannah Lange3, Akashdeep Kamra4, Hubert Ebert3, and Ulrich Nowak5 — 1Uppsala University, Uppsala, Sweden — 2Freie Universität Berlin, Berlin, Germany — 3LMU Munich, Munich, Germany — 4Universidad Autónoma de Madrid, Madrid, Spain — 5University of Konstanz, Konstanz, Germany
In recent years, it has been shown that it is not only possible to transfer angular momentum from the spin system to the lattice on ultrashort time scales, but also that this process can be reversed by using circularly polarized terahertz light pulses [1].
To contribute to the understanding of angular momentum transfer between spin and lattice degrees of freedom, we have developed a theoretical multiscale framework for spin-lattice coupling [2], which is linked to ab-initio calculations on the one hand and magnetoelastic continuum theory on the other. Here I will discuss how this framework can be used to calculate magnon-phonon coupling parameters, emphasizing the importance of a Dzyaloshiskii-Moriya type interaction for angular momentum transfer in iron, and to perform simulations to study the combined magnetic and mechanical motion of ferromagnetic nanoparticles.
[1] Dornes et al., Nature (London) 565, 209 (2019); Tauchert al., Nature (London) 602, 73 (2022); Luo et al., Science 382, 698 (2023). [2] Mankovsky et al., PRL 129, 067202 (2022); Weißenhofer et al., PRB 108, L060404 (2023).