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MA: Fachverband Magnetismus

MA 11: INNOMAG e.V. Dissertationspreis und Diplom-/Masterpreis 2017 — Vorträge der Nominierten

MA 11.3: Vortrag

Montag, 20. März 2017, 16:00–16:20, HSZ 101

Coupled vortex-antivortex oscillation studied by Time-resolved Scanning Electron Microscopy with Polarization Analysis — •Fabian Kloodt, Robert Frömter, Philipp Staeck, Susanne Kuhrau, and Hans Peter Oepen — Universität Hamburg

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, F. Kloodt, Appl. Phys. Lett. 108, 142401 (2016).