Tailoring band structures in two-dimensional antidot magnonic crystals through heterogeneous elastic strain

We present a combined experimental and numerical investigation of strain-mediated control of spin-wave dynamics in two-dimensional antidot magnonic crystals. Using a finite-element approach coupling elasticity and micromagnetism, we demonstrate that static elastic strain, when efficiently transferred from a ferroelectric substrate, induces direction- and mode-dependent modifications of the magnonic band structure. The resulting magnetoelastic anisotropy leads to nonuniform frequency shifts and selective tuning of magnonic band gaps, with strain-induced frequency variations approaching 1 GHz for moderate (0.2%) strain. We further show that strain heterogeneity, arising from the mechanical contrast between the magnetic film and the substrate, introduces local perturbations of the internal field that reshape the band topology. These results establish elastic strain as an effective and scalable parameter for engineering reconfigurable and energy-efficient magnonic devices.