Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.6: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Spin dynamics of skyrmion lattices in a chiral magnet resolved by micro-focused Brillouin light scattering — Ping Che1, •Riccardo Ciola2, Markus Garst2, Arnaud Magrez1, Helmuth Berger1, Thomas Schönenberger1, Henrik Rønnow1, and Dirk Grundler1 — 1École Polytechnique Fédérale de Lausanne, Lausanne (CH) — 2Karlsruhe Institute of Technology, Karlsruhe (DE)
Chiral magnets provide an innovative framework to study non-collinear spin textures and their associated magnetization dynamics. They include helical and conical magnetic textures that are spatially modulated with a wavevector kh, as well as the topologically non-trivial skyrmion lattice (SkL) phase. So far, different techniques have been used to probe the magnetization dynamics of the latter SkL phase both in the small wavevector limit, k<<kh, as well as for k>kh. Here, we show that Brillouin light scattering (BLS) is ideally suited to probe the complementary range of wavevectors k kh. We study both theoretically and experimentally BLS from bulk spin waves in the SkL phase of Cu2OSeO3. We provide parameter-free predictions for the BLS cross section and compute both the resonances and their spectral weight. The theoretical results are compared to BLS experiments in the backscattering geometry that probe magnons with a wavevector k=48/µ m < kh = 105/µ m. The clockwise, counterclockwise and breathing modes are clearly resolved. Due to the finite wavevector of the magnon excitations, finite spectral weight is theoretically predicted also for other resonances. Experimentally, at least one additional resonance can be identified.