Dynamic micromagnetic simulations of susceptibility spectra in thin films with non-uniform magnetization distributions

Summary form only given. The high-frequency response of magnetic systems to a weak RF magnetic field can be characterized by the dynamic susceptibility tensor. The aim of this paper is to demonstrate the ability of dynamic micromagnetic simulations for investigating the high-frequency susceptibility spectra of thin films with nonuniform magnetization distributions. As an illustrative example, the case of ferromagnetic films supporting a weak-stripe-domain structure is addressed. The zero-field susceptibility spectra over the frequency range 0.1-40 GHz are computed using a 2D dynamic micromagnetic model. These spectra exhibit multiple resonances whose number and resonance frequencies depend on the equilibrium spin configuration and on the RF exciting field orientation. A modal analysis permits us to correlate these magnetic excitations with spin regions of the stripe domain structure.