Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 39: Poster Magnetism II

MA 39.11: Poster

Mittwoch, 11. März 2026, 18:00–21:00, P2

Spin-lattice coupling as a source of chiral phonons in cubic magnets — •Yelyzaveta A. Borysenko, Daniel Schick, and Ulrich Nowak — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

Hybrid spintronic device concepts can be implemented based on angular momentum, as this can be transferred over significant distances and effectively exchanged between different quasiparticles. The understanding, control, and effective generation of angular momentum is crucial for such applications.

The creation and manipulation of chiral phonons introduces an additional degree of freedom, as they can couple to other quasiparticles in a chirality-selective manner as well as transfer angular momentum obtained from magnons. Chiral phonons mainly occur in materials with inversion-symmetry breaking, although recent works proved that they can be also generated in materials preserving this symmetry due to spin-lattice coupling [1], which was also experimentally demonstrated with ultrafast demagnetization in a nickel thin film [2].

In this work, we linearize the coupled equations of motion for the spin and lattice degrees of freedom assuming a coupling term of anisotropy type. We describe the appearance of chiral phonons induced by spin-lattice coupling comparing cubic ferromagnets and antiferromagnets, calculate angular momentum of the modes and discuss the chirality selective coupling of magnon and phonon bands.

[1] M. Weißenhofer et al., Phys. Rev. Lett. 135, 216701 (2025);

[2] S. R. Tauchert et al., Nature 602, 73 (2022);

Keywords: spin-lattice coupling; chiral phonons; magnon polaron; chirality-selective coupling