Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.30: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Backscattering-Immune Spin-Wave Modes for Protected Magnon Transport — •Morteza Mohseni, Qi Wang, Burkard Hillebrands, and Philipp Pirro — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.

Protected transport of energy and particles has been an intensive subject of research during the last decade. It has stimulated a lot of interest in the field of topological insulators. The idea of protected transport transferred into the realm of magnonics by considering different types of magnonic crystals. Indeed, protected magnon transport would constitute a major breakthrough in reducing the losses, which are associated with, e.g., defects and inhomogeneities in magnonic networks for data processing. Here, we show that in homogeneous magnetic thin films, backscattering-immune spin-wave modes exist. Using micromagnetic simulations, we show that in an in-plane magnetized film with relatively small thickness, non-reciprocal waves which propagate perpendicular to the static magnetization can be robust against even large inhomogeneities and defects. Such robust and non-reciprocal spin waves open the possibility for designing highly efficient magnonic elements. In addition, their strong protection should stimulate further investigation of the topology of those waves.