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We present a finite-difference micromagnetic approach for determining thenormal modes of spin-waves propagating in extended magnetic films and strips,which is based on the linearized Landau-Lifshitz equation and uses the dynamicmatrix method. The model takes into account both short range exchangeinteractions and long range dipole-dipole interactions. The latter areaccounted for through plane-wave dynamic demagnetization factors, which dependnot only on the geometry and relative positions of the magnetic cells, as usualdemagnetization factors do, but also on the wave vector of the propagatingwaves. Such a numerical model is most relevant when the spin-wave medium isspatially inhomogeneous perpendicular to the direction of propagation, eitherin its magnetic properties or in its equilibrium magnetic configuration. Weillustrate this point by studying surface spin-waves in magnetic bilayer filmsand spin-waves channelized along magnetic domain walls in perpendicularlymagnetized strips. In both cases, dynamic dipolar interactions producenon-reciprocity effects, where counter-propagative spin-waves have differentfrequencies.

Propagating spin-wave normal modes: A dynamic matrix approach using plane-wave demagnetizating tensors