Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.2: Poster
Wednesday, March 18, 2020, 15:00–18:00, P3
Sub-micrometer near-field focusing of spin waves in ultrathin YIG films — •Boris Divinskiy1, Nicolas Thiery2, Laurent Vila2, Olivier Klein2, Nathan Beaulieu3, Jamal B. Youssef3, Sergej O. Demokritov1, and Vladislav E. Demidov1 — 1University of Münster, Münster, Germany — 2Univ. Grenoble Alpes, CNRS, CEA, Grenoble INP, IRIG-SPINTEC, Grenoble, France — 3LabSTICC, CNRS, Université de Bretagne Occidentale, Brest, France
We experimentally demonstrate tight focusing of a spin wave beam excited in extended nanometer-thick films of Yttrium Iron Garnet by a simple microscopic antenna functioning as a single-slit near-field lens. We show that the focal distance and the minimum transverse width of the beam can be controlled in a broad range by varying the frequency/wavelength of spin waves and the antenna geometry. The experimental data are in good agreement with the results of numerical simulations. Our findings provide a simple solution for implementation of magnonic nano-devices requiring local concentration of the spin-wave energy.