Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.25: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Unidirectional excitation and interference of caustic-like spin-wave beams — •Frank Heussner, Matthias Nabinger, Milan Ender, Alexander A. Serga, Burkard Hillebrands, and Philipp Pirro — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany

Caustic-like spin-wave beams can be used to steer spin-wave energy in 2D magnetic structures. Hence, they are promising candidates to expedite the development of 2D magnonic logic chips in which interference effects are expected to play an important role for data processing.

Caustic-like beams are formed due to the superposition of different spin-wave modes, which cover a broad range of wavevectors. Consequently, their interference can lead to complex phenomena.

In this work, we present a detailed study of the interference of caustic-like spin-wave beams in 2D magnetic media by utilizing micromagnetic simulations. General laws regarding the control of the observed interference effects are deduced and exemplified. In addition, based on these findings, a method for unidirectional excitation and phase-dependent steering of caustic-like spin-wave beams is revealed. Our results open doors to new possibilities for the technical application of spin waves in 2D microstructures.

Financial support by DFG within project SFB/TRR 173 Spin+X is gratefully acknowledged.