Fig. 4: Tailoring of transmission gaps.
From: Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation
a Spin-wave transmission spectra (amplitude of S12) measured on a 70-nm-thick YIG film with two and four 250-nm-wide CoFeB stripes (green and blue curves) and the same YIG film without stripes (orange curve). μ0Hext = +6 mT and the center-to-center distance between the stripes (period p) is 500 nm. b Dependence of the transmission gap size on magnetic bias field for samples with four and eight 250-nm-wide CoFeB stripes. c Spin-wave transmission spectra recorded at μ0Hext = +6 mT and contour plot of the S12 amplitude as a function of magnetic bias field for a resonator structure with eight CoFeB stripes. The stripe widths increase from 200 to 270 nm in 10 nm steps. The orange curve depicts a reference measurement on the same YIG film without stripes. d Variation of the transmission gap size with magnetic bias field for the same sample as in (c). e Comparison of spin-wave transmission spectra recorded on resonator structures with four 550-nm-wide Py stripes and four 550-nm-wide CoFeB stripes. The YIG film is 100-nm thick, p = 1 μm, and μ0Hext = +10 mT. f Spin-wave dispersion relations for YIG/Py and YIG/CoFeB bilayers at μ0Hext = +10 mT.
