Modeling of the influence of defects on magnonic spectra of permalloy antidot arrays

In this work, we numerically investigate the influence of randomly distributed lattice defects (non-patterned areas and variable hole size) on the ferromagnetic resonance behavior and spin wave mode profiles of 2D permalloy antidot arrays with hexagonal lattice. In order to have a realistic distribution of disorder, we simulate large-scale samples (with ~10 μm size) by means of a GPU-based micromagnetic solver, which combines a fast multipole method for the magnetostatic field calculation to a finite difference technique for the exchange field evaluation on non-structured meshes.