Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.2: Vortrag
Montag, 17. März 2025, 09:45–10:00, H18
Nanoscale YIG-Based Magnonic Crystals — •Khrystyna Levchenko1, Kristýna Davídková1, Mathieu Moalic2, Carsten Dubs3, Michal Urbánek4, Qi Wang5, Maciej Krawczyk2, and Andrii Chumak1 — 1University of Vienna, Austria — 2A. Mickiewicz University, Poland — 3INNOVENT, Germany — 4CEITEC Nano, Czech Republic — 5Huazhong University, China
Magnonic crystals (MCs) are a spin-wave (SW) based class of artificial magnetic materials characterised by a spatially periodic variation of their properties. The combination of design flexibility and SW intrinsic advantages makes MCs promising candidates for RF applications, although multi-mode SW propagation disturbs the operating characteristics. To overcome this, it is necessary to work with nanostructures in the single-mode regime. Leveraging recent progress in materials science and fabrication techniques, we have realised 1D MCs from 100 nm thick epitaxial yttrium iron garnet (YIG) films. The MCs were developed using electron beam lithography, ion etching and evaporation, with periodicities of 1 μm and optimised notches (100-250 nm depth) or antidots (100-150 nm diameter). Microstrip antennae were used for SW excitation and detection. Experimental characterisation using micro-focused Brillouin light scattering and propagating spin-wave spectroscopy, supported by simulations (TetraX), confirmed efficient single-mode SW transport over a distance of 10 μm and bandgap formation. These results pave the way for further advances, such as 2D arrays with magnon guidance and topologically protected magnon transport - a milestone yet to be achieved experimentally.
Keywords: Magnonic crystal; Nanoscale; Epitaxial Yttrium Iron garnet (YIG) films; Brillouin Light Scattering (BLS) spectroscopy; Propagating Spin-Wave Spectroscopy (PSWS)