Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II
MA 43.3: Talk
Friday, March 21, 2025, 10:00–10:15, H16
Pathways to Bubble and Skyrmion Lattice Formation in Fe/Gd Multilayers — Tim Titze1, Sabri Koraltan2, Timo Schmidt3, Dieter Suess2, Manfred Albrecht3, Stefan Mathias1, and •Daniel Steil1 — 1University of Goettingen — 2University of Vienna — 3University of Augsburg
Fe/Gd multilayers host a rich variety of magnetic textures, including topologically trivial bubbles and topologically protected skyrmions [1-4]. Using time-resolved Kerr spectroscopy, we highlight how different control strategies including temperature T, out-of-plane magnetic fields H and femtosecond light excitation can be used to create such textures via different pathways. We find that varying the magnetic field at constant temperature leads to a different (H,T) phase diagram of magnetic textures than moving along a temperature trajectory at constant magnetic field, which is corroborated by micromagnetic simulations. We furthermore show that bubble and skyrmion (BSK) creation by impulsive light excitation is at least partially a non-adiabatic process, as the creation occurs in parts of the (H,T) phase diagram, where neither the constant T nor the constant H trajectory predict their existence. We discuss a possible scenario for the creation of BSKs in this material system involving the inhomogeneity of the excitation process.
[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., Adv. Funct. Mater. 34, 2313619 (2024)
[4] T. Titze et al., Phys. Rev. Lett. 133, 156701 (2024)
Keywords: Magnetic texture; Skyrmions; Topological order; Magnetic thin films