Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 5: Magnetization/Demagnetization Dynamics
MA 5.4: Talk
Monday, March 20, 2017, 10:15–10:30, HSZ 401
Dynamics of coupled topological Solitons — •Fabian Kloodt1, Robert Frömter1,2, Philipp Staeck1, Susanne Kuhrau1, and Hans Peter Oepen1,2 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
In the framework of the Thiele-equation magnetic vortices and antivortices can be treated as quasi-particles, i.e. solitons. Confining a single (anti-)vortex in a magnetic microstructure causes linear restoring forces, which results in an oscillator equation describing the field-driven motion of individual solitons. Using TR-SEMPA [1] we investigate coupling effects in vortex-antivortex chains in patterned FeCoSiB-structures. While the vortices exhibit a clear oscillation the antivortices show no apparent motion. Both types of magnetic solitons are mutually coupled via the domain energy (part of the stray-field energy), resulting in a coupled oscillation mode under HF-field excitation. TR-SEMPA results and micromagnetic simulations stand in excellent agreement indicating that coupling dominates the motion of the individual solitons.
[1] R. Frömter, Appl. Phys. Lett. 108, 142401 (2016).