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We report, for the first time, on a novel planar structure ofmagnonic-crystal waveguides, made of a single magnetic material, in which theallowed and forbidden bands of propagating dipole-exchange spin-waves can bemanipulated by the periodic modulation of different widths in thin-filmnanostrips. The origin of the presence of several magnonic wide band gaps andthe crucial parameters for controlling those band gaps of the order of ~10 GHzare found by micromagnetic numerical and analytical calculations. This work canoffer a route to the potential application to broad-band spin-wave filters inthe GHz frequency range.

Physical Origin and Generic Control of Magnonic Band Gaps of Dipole-Exchange Spin Waves in Width-Modulated-Nanostrip Waveguides