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MA: Fachverband Magnetismus
MA 30: Skyrmions II
MA 30.6: Vortrag
Mittwoch, 20. März 2024, 16:30–16:45, EB 301
Laser-induced real-space topology control of spin wave resonances — •Tim Titze1, Sabri Koraltan2, Timo Schmidt3, Marcel Möller4, Florian Bruckner2, Claas Abert2, Dieter Suess2, Claus Ropers4, Daniel Steil1, Manfred Albrecht3, and Stefan Mathias1 — 1University of Göttingen, Germany — 2University of Vienna, Austria — 3University of Augsburg, Germany — 4Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
Materials exhibiting magnetic spin textures promise advanced magnetic control via the generation of laser-induced ultrafast and non-equilibrium spin dynamics. We investigate ferrimagnetic [Fe(0.35 nm)/Gd(0.40 nm)]160 multilayers, which host a rich diversity of magnetic spin textures including stripe domains, a dense bubble/skyrmion (B/SK) lattice, and a single domain state [1, 2]. Using fs Kerr spectroscopy, we can unambiguously identify the different magnetic spin textures, as we observe distinct coherent spin wave dynamics in response to weak laser excitation. Strong laser excitation allows us to achieve versatile control of the coherent spin dynamics via non-equilibrium and ultrafast transformation of magnetic spin textures by both creating and annihilating B/SKs. We further corroborate these findings by micromagnetic simulations and Lorentz transmission electron microscopy with in-situ optical excitation [3].
[1] S. A. Montoya et al., Phys. Rev. B 95, 2024415 (2017)
[2] M. Heigl et al., Nat. Commun. 12, 261 (2021)
[3] T. Titze et al., arXiv preprint arXiv:2309.12956 (2023)
Keywords: Skyrmions; Magnetic spin textures; Ultrafast spin dynamics; Magneto-optics; Topological matter