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MA: Fachverband Magnetismus
MA 10: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum II (joint session MA/TT)
MA 10.8: Vortrag
Dienstag, 18. März 2025, 11:30–11:45, H16
Spin-spin interaction via chiral phonons — •Daniel Schick1, Markus Weißenhofer2, 3, Akashdeep Kamra4, and Ulrich Nowak1 — 1University of Konstanz, Konstanz, Germany — 2Uppsala University, Uppsala, Sweden — 3Free University of Berlin, Berlin, Germany — 4University of Kaiserslautern-Landau, Kaiserslautern, Germany
Coupling between the magnetic degrees of freedom and phonons has emerged as a topic of great importance for explaining various magnetic phenomena, like ultrafast demagnetization processes [1], and the possibility to affect magnetization dynamics via phonon pumping [2].
We develop a tool to study spin-lattice coupling in atomistic simulations, which conserves total angular momentum.
This allows us to precisely retrace the transfer of angular momentum between the spin and lattice systems. We demonstrate the emergence of an effective spin-spin interaction mediated by chiral phonons.
This effect can arise from thermal phonons as follows. A spin may precess after coupling to a phonon, with this precession producing chiral phonons, which in turn, affect other spins.
A similar effect can be achieved by driving a spin to induce chiral phonons.
We discuss the dependence of this interaction on the temperature and strength of the spin-lattice interaction and discuss our findings within the context of phonon-enhanced magnon transport phenomena.
[1] S. R. Tauchert, et. al., Nature 602, 73 (2022)
[2] R.Schlitz et. al. Phys. Rev. B 106, 014407 (2022)
Keywords: Spin-lattice interaction; Chiral phonon; Atomistic simulation; Angular momentum transfer