Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.10: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
Imaging of conversion between different spin wave modes in thermal landscapes with micro-structured induction loops — •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, Germany — 2Fraunhofer-Institute for Physical Measurement Techniques IPM, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany
Spin wave propagation in thin ferrimagnetic films (YIG) can be described as wave propagation, following in most cases the well-known laws of optical propagation, e. g., Snell's law of refraction [Phys. Rev. Lett. 117, 037204 (2016)]. In contrast to optical materials, the dispersion relation of spin waves strongly depends on the direction of the external magnetic field. For in-plane magnetization backward volume magnetostatic spin waves (BVMSW) as well as magnetostatic surface spin waves (MSSW) can be excited, although situated at different frequency regions. A specially designed coplanar waveguide allows to excite spin wave beams [Sci. Rep. 6, 22367 (2016)]. Inducing a beam-splitter via thermal landscapes [Nature Physics 11, 487 (2015)] leads to a redirection of the beam and, hence, to a conversion from BVMSW to MSSW. This conversion and propagation can be observed with micro-structured induction loops, which are scanned over the sample. 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.