Effect of interdot coupling on spin-wave modes in nanoparticle arrays

We have developed a theory for the determination of the collective spin-wave modes of regular arrays of magnetic particles, taking into account the dipolar interaction among particles. The frequencies and profiles of the spin modes of arrays of permalloy cylindrical particles with different interparticle separation have been calculated with a numerical implementation of this model, using a three-dimensional representation of the magnetic particles in their actual nonuniform fundamental state. The results show a very good agreement with recently published experimental data, and allow us to discuss the dispersion curves and some relevant properties of the Brillouin light-scattering intensity from spin modes in periodic arrays.