Dipole-exchange spin waves in heterostructures with a non-magnetic spacer

We present calculations for the dipole-exchange spin wave spectrum of two ferromagnetic thin films separated by a non-magnetic spacer. We employ a microscopic model that takes into account the position dependence of the spin sites in each media. The results show the frequency shift and mode mixing caused by the dipolar interaction between the films as a function of spacer thickness, for films with parallel magnetization.