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MA: Fachverband Magnetismus
MA 9: Ultrafast Magnetization Effects II
MA 9.4: Talk
Monday, March 18, 2024, 16:00–16:15, H 2013
Phonon mediated spin-spin interaction — •Daniel Schick1, Markus Weißenhofer2,3, Akashdeep Kamra4, and Ulrich Nowak1 — 1Fachbereich Physik, Universität Konstanz, Konstanz, Germany — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden — 3Department of Physics, Freie Universität Berlin, Berlin, Germany — 4IFIMAC - Condensed Matter Physics Center, Universidad Autónoma de Madrid, Madrid, Spain
The transfer and control of angular momentum is a key aspect for spintronic applications. Recently, it has been realized, that even the lattice can contribute to the exchange of angular momentum via chiral phonons. To simulate spin lattice coupling, we developed a numerical method, which is able to conserve the total angular momentum, allowing us to precisely track changes thereof in transfers between the spin and lattice system [1, 2]. In our simulations, magnetic spins can excite chiral phonons, which themselves are able to elicit a response of other spins, creating an effective spin-spin coupling via phonons. We discuss this interaction by driving spins to investigate the processes involved and determine the importance of the chirality of the phonons. In finite-temperature simulations, we investigate the thermodynamic implications of this interaction.
[1] S. Mankovsky et. al, Phys. Rev. Lett. 129, 067202, (2022)
[2] M. Weißenhofer et. al, Phys. Rev. B 108, L060404, (2023)
Keywords: Spin-lattice coupling; Chiral phonons; Angular momentum transfer; Symplectic integrator