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We have investigated theoretically (with micromagnetic simulations and planewave method) and experimentally (with ferromagnetic resonance and Brillouinlight scattering) three types of antidot lattices (ADLs) based on permalloythin films with increased complexity of the unit cell: simple square,bi-component square and wave-like ADL. We have found that placing a smalladditional antidot in the center of the unit cell of the square ADL modifysignificantly the spin wave spectrum and its dependence on the orientation ofthe in-plane magnetic field. We also check the further changes of spin wavespectrum resulting from the introduction of air-gaps connecting small and largeantidots. In particular, the presence of small antidots change the dependenceof the frequency of the fundamental mode on the angle of the in-plane appliedmagnetic field. The air-gaps strongly discriminates the propagation of spinwaves in two principal direction of ADL lattice, orthogonal to each other. Inspite of these spectral changes, the spatial distribution of the spin waveamplitude generally preserves some similarities for all three structures. Wealso highlighted out the role of defects in the ADL in the observed spectra.The obtained results can be interesting for the magnonics applications of themagnonic crystals.

Geometrical complexity of the antidots unit cell effect on the spin wave excitations spectra