Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnonics I
MA 31.8: Vortrag
Mittwoch, 14. März 2018, 17:15–17:30, H 0110
Spin-Wave Optics in Magnetization Landscapes — Rick Aßmann1, •Marc Vogel1, Andrii V. Chumak1, Burkard Hillebrands1, and Georg von Freymann1,2 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Str. 56, 67663 Kaiserslautern — 2Fraunhofer-Institute for Industrial Mathematics ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern
Spin-wave propagation in ferrimagnetic films (several micrometers thick yttrium iron garnet) follows the well-known laws of optical propagation, e. g., Snell's law of refraction [Phys. Rev. Lett. 117, 037204 (2016)]. In conventional optics, low divergent light beams are often used in the experimental setup. To do optics with spin waves, the excitation of spin-wave beams is necessary. Therefore, we use specially designed coplanar waveguides or microstrip antennas [Sci. Rep. 6, 22367 (2016)]. The spin-wave propagation can be observed in the experiment with micro-structured induction probes, which are scanned over the sample. We propose to use optically-induced magnetization landscapes [Nature Physics 11, 487 (2015)] to create the building blocks of spin-wave optics, e. g., spin-wave (graded-index) lenses, fibers, beam-splitter or diffraction gratings. Moreover, spin-wave Fourier optics can be realized by exploiting the properties of spin-wave lenses. We compare our experimental results with micromagnetic simulations.
Financial support by DFG collaborative research center SFB/TRR 173 "Spin+X" (project B04) is gratefully acknowledged.