Spin Wave Excitations in Periodic Nanostructures: Evolution from Periodical Perturbations to Magnonic Crystals

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The main objective of the project is to investigate the spin wave dynamics in the transition regime from a flat film with periodical nanostructures on top towards a full 1D or 2D magnonic crystal. This regime exhibits the beginning of the mode splitting due to the two-magnon interaction, which in magnonic crystals finally lead to the opening of band gaps. Compared to studies on full magnonic crystals no attention has been paid to this important transition regime so far.Experimental techniques like broadband ferromagnetic resonance, time-resolved magnetooptical Kerr effect as well as Brillouin light scattering will be employed to study the magnon excitations in those nanostructures. In close collaboration with the theory group of Prof. P. Landeros (UTFSM Chile) already existing analytical theory will be applied and further developed to match and explain the experimental findings, e.g. descriptions and meaning of the individual modes, understanding of the development of the avoided band crossing, as well as insight into enhanced damping effects in such structures.