Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 54: Magnetic textures: Transport and dynamics III
MA 54.7: Talk
Friday, April 5, 2019, 11:00–11:15, H37
Characterizing breathing modes of magnetic (anti-)skyrmions with the Hamiltonian formalism — •B. F. McKeever1, D. R. Rodrigues1, D. Pinna1, Ar. Abanov2, Jairo Sinova1,3, and K. Everschor-Sitte1 — 1Johannes Gutenberg University Mainz, Germany — 2Texas A&M University, College Station, USA — 3Institute of Physics ASCR, Prague, Czech Republic
We derive an effective Hamiltonian system describing the low energy dynamics of circular magnetic skyrmions and antiskyrmions using collective coordinates [1]. An effective energy landscape reveals two qualitatively different types of breathing behavior. For small energy perturbations we reproduce the well-known small breathing mode excitations, where the magnetic moments of the skyrmion oscillate around their equilibrium solution. At higher energies we find a rotational breathing behavior, transforming Neel to Bloch skyrmions and vice versa. For a damped system we observe the transition from the continuously rotating and breathing skyrmion into the oscillatory one. We analyze the characteristic frequencies of both types, as well as their amplitudes and energy dissipation rates. For rotational (oscillatory) breathing modes we predict on average a linear (exponential) decay in energy. This stark difference in dissipative behavior should be observable in the frequency spectrum of excited (anti-)skyrmions.
[1] B. F. McKeever et al., arXiv:1811.09949