Dynamic susceptibility computations for thin magnetic films

摘要

This paper deals with the dynamic modelling of thin ferromagnetic layers, based on the coupling of Maxwell's equations with the nonlinear Landau–Lifschitz–Gilbert law. A 2-D micromagnetic model is described which involves a FDTD code to determine equilibrium configurations and a finite element method to compute magnetostatic fields. Finally, after linearization, the susceptibility spectra of films supporting a weak-stripe-domain structure are computed and successfully compared to existing measurements without introducing any fitting parameter.