Magnetization dynamics of buckling domain structures in patterned thin films

The magneto-dynamics of lense shaped thin lm elements where studied using vector network analyzer ferromagnetic resonance (VNA-FMR). An unexpected strong increase of the resonance frequency was found when approaching the switching eld. Using Magnetic Force Microscopy this resonance increase could be ascribed to the formation and evolution of a buckling domain state. The experimental data have been qualitatively reproduced by micromagnetic simulations of a model element. Thereby the role of the external magnetic eld and the buckling wavelength was studied separately. Domain modes with dynamic magnetization modulations parallel and perpendicular to the static magnetization were identied. We derive qualitative arguments based on mageto-static energy considerations that allow for an interpretation of the dynamic response in such low-symmetric magnetization distributions.