Abstract
A model of a magnetic multilayer structure in the micromagnetic approximation is outlined and applied to the study of cobalt-based multilayers with nonmagnetic spacers. The field swept ferromagnetic resonance is studied in athermal simulations with continuous cobalt layers and with granular cobalt layers with nonmagnetic grain boundaries. Results are obtained which agree qualitatively with recent experimental observations. The response of the systems are analyzed in terms of the elementary excitations by introducing a Hamiltonian formalism and spectral decomposition. The eigenfrequencies of the continuous magnetic medium are found to differ dramatically as compared to the granular magnetic medium confirming the break up of the intralayer symmetry produced by the nonmagnetic grain boundaries.
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