Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.36: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Design of a spin-wave flat lens — •Mateusz Zelent1, Paweł Gruszecki1, Marina Mailian2, Oksana Gorobets2, Yuri Gorobets2,3, Maciej Krawczyk1, and Vishal Vashista1 — 1Faculty of Physics, Adam Mickiewicz University in Poznan, Umultowska 85, Poznan, 61-614, Poland — 2Faculty of Physics and Mathematics, National Technical University of Ukraine *Igor Sikorsky Kyiv Polytechnic Institute*, 37 Peremogy Avenue, Kyiv, 03056, Ukraine — 3Institute of Magnetism, National Academy of Sciences of Ukraine, 36-b Vernadskogo Street, Kyiv, 03142, Ukraine
The focusing of plane spin waves propagating in a thin ferromagnetic film by designed phase-shift on a metasurface formed by the ultranarrow interface was studied. We demonstrated with micromagnetic simulations and analytical model, that the effect exists for the exchange spin waves propagating in thin Co film in transmission through the interface, where interlayer exchange interactions are present. The phase shift of transmitted spin waves is achieved by introducing ultrathin nonmagnetic metallic spacer, with a width much smaller than the spin wave wavelength. Due to RKKY interaction, the change of the metal width allows to modify interfacial exchange coupling, which determine the phase of the transmitted spin waves. We combine this phase-shift dependency along the interface with the lens equation to design a spin wave flat lens based on magnonic matasurface. Funded from the EU Horizon 2020, G.A. No. 644348.sign a spin wave flat lens based on magnonic matasurface.