Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Computational Magnetism I

MA 2.1: Talk

Monday, March 18, 2024, 09:30–09:45, H 1058

Inertial spin waves in non-collinear spin structures — Mikhail Cherkasskii¹, Ritwik Mondal², and •Levente Rózsa^3,4 — ¹RWTH Aachen, Aachen, Germany — ²Indian Institute of Technology (ISM) Dhanbad, Dhanbad, India — ³HUN-REN Wigner Research Centre for Physics, Budapest, Hungary — ⁴Budapest University of Technology and Economics, Budapest, Hungary

Inertial phenomena emerge in magnetic materials at very short time scales, where the directions of the angular momentum and the magnetic moment become separated. The inertia gives rise to high-frequency excitations which have been observed in ferromagnetic resonance experiments [1]. These excitations form inertial spin-wave bands which have been studied in ferromagnets and collinear antiferromagnets [2].

Here, we discuss the properties of inertial spin waves in non-collinear spin structures. We generalize the linearized inertial Landau-Lifshitz-Gilbert equation used for the calculation of spin-wave modes to arbitrary spin configurations. We apply the method to spin spirals to interpolate between the ferromagnetic and collinear antiferromagnetic limits, and demonstrate the formation of flat bands and non-reciprocal inertial spin-wave dispersion.

[1] K. Neeraj et al., Nat. Phys. 17, 245 (2021). [2] R. Mondal et al., J. Magn. Magn. Mater. 579, 170830 (2023).

Keywords: inertial spin dynamics; non-collinear spin structures; spin-wave dispersion