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Bandgaps matter because they let us forbid spin-wave propagation in selected frequency windows—enabling filtering, routing, and on/off control of magnonic signals (the spin-wave analogue of an electronic bandgap).
We realize a nanoscale 1D YIG magnonic crystal by patterning a nanowaveguide with a periodic line of holes, aiming for RF-grade filtering with cleaner band edges than in wide, multimode waveguides. - *Method:* 1D YIG nanowaveguide magnonic crystal (holes d ≃ 150 nm, period a = 1,μ m, width ≃ 320 nm, thickness = 100 nm). Propagation measured via PSWS in Damon–Eshbach geometry; interpreted with TetraX + MuMax3/Amumax dispersion simulations.
the measured S12 transmission shows multiple rejection bands—these are the bandgaps from Bragg scattering on the hole lattice. The overlaid dispersion/Bragg markers show where the Bragg condition intersects the modes. Importantly, the spectrum isn’t just ‘gaps’: the dispersion reveals two major anticrossings around k≈3.1 k≈3.1 and 18.7 rad/μm 18.7 rad/μm. Those hybridizations explain the strongest transmission features and where propagation becomes inefficient. The device gives deep, field-tunable rejection (up to  26 dB) with measurable propagation over microns, and the dispersion analysis tells you which mode actually carries the signal—mainly n=2 n=2 between the anticrossings. That’s a practical design route toward nanoscale YIG RF filters and, next, 2D nanoarrays.