Abstract
A formulation of micromagnetics based on equations of motion in the Hamiltonian form is applied to the simulation of ferromagnetic resonance in Cobalt based magnetic/nonmagnetic multilayers. A two-peak feature in the field swept FMR absorption curve recently observed experimentally is reproduced. A semiclassical micromagnetic spin wave theory is presented and used to calculate the dispersion curves and amplitude spectra of the multilayers at various values of the external field. It is found that uniform precession dominates all in-plane modes, and that the features in the FMR absorption curve coincide with the sudden excitation of the first spin wave mode in the perpendicular direction.
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