An effect of metallization of the magnonic crystal surface on the band gapsformation in the spectra of the surface spin wave (SSW) is studied boththeoretically and experimentally. The structures under consideration areone-dimensional magnonic crystals based on yttrium iron garnet with an array ofetched grooves with metal screen on the top of the corrugated surface andwithout it. Due to nonreciprocity of propagation of the SSW the shift of bandgap to higher frequency and from the border of the Brillouin zone in presenceof conducting overlayer was measured in transmission line experiment. Resultsof numerical calculations and model analysis are in agreement with experimentaldata and give further insight into origin of the band gap and properties of thenonreciprocal SSW in metallized magnonic crystals. This gives positive answerto the outstanding question about possibility of detection of magnonic bandgaps in the spectra of the spin waves with nonreciprocal dispersion in magnoniccrystals and creates potential for new applications and improvements of alreadyexisting prototype magnonic devices.
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