Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Non-ultrafast magnetization dynamics

MA 23.10: Vortrag

Mittwoch, 14. März 2018, 12:00–12:15, H 0112

Coupling between vortices and antivortices in a cross-tie wall studied by time-resolved SEMPA — •Fabian Kloodt-Twesten, Susanne Kuhrau, Philipp Staeck, Hans Peter Oepen, and Robert Frömter — Center for Hybrid Nanostructures, Universität Hamburg, Germany

In the framework of the Thiele equation magnetic vortices and antivortices can be treated as quasiparticles. 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 the coupling of magnetic vortices and antivortices in a cross-tie wall in rectangular FeCoSiB-structures. While the vortices exhibit a clear oscillation the antivortices show almost no discernible movement. 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 show an excellent agreement indicating that the boundary condition in the sample together with a strong coupling between both solitons is the driving mechanism of the observed behavior. The motion is composed from the contributions of two terminating vortices and a mutual vortex-antivortex coupling along the confined cross-tie structure.

[1] R. Frömter et al., Appl. Phys. Lett. 108, 142401 (2016).