Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.41: Poster

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

Phase-modulated Fresnel zone plate for spin waves in bulk and thin-film geometry — •Piotr Graczyk¹, Irina Tukavkina², Mateusz Zelent¹, Oksana Gorobets^2,3, and Maciej Krawczyk¹ — ¹Faculty of Physics, Adam Mickiewicz University in Poznan, Umultowska 85, 61-614 Poznan, Poland — ²National Technical University of Ukraine, "Igor Sikorsky Kyiv Polytechnic Institute", 37 Peremogy Ave., 03056, Kyiv, Ukraine — ³Institute of Magnetism, National Academy of Sciences of Ukraine, 36-b Vernadskogost., 03142, Kyiv, Ukraine

We present results of investigation on the metasurface designed to effectively focus spin wave by means of diffraction. The boundary conditions [1] for the interlattice exchange and surface anisotropy were introduced at the interface of two ferromagnetic media to form phase-modulated Fresnel zone plate. The problem was treated analytically and supported by the numerical simulations. We extended the investigation to the case of the interface in a thin-film geometry with dipolar interactions included. It is shown, that proper tuning of the anisotropy at the interface keeps the tramsmittivity at a high level while the exchange between adjacent materials is weak, leding to the significant phase shift. We keep parameters of our model close to the realistic values, providing a way for experimental realization.

[1] V.V. Kruglyak, O.Y. Gorobets, Y.I. Gorobets, and A.N. Kuchko, J. Phys. Condens. Matter 26, 406001 (2014).

Financial support from the EU*s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie GA No.644348 (MagIC)