SPIN-WAVE RESONANCES OF COBALT-BASED MULTILAYERS

A formulation of micromagnetics based on equations of motion in the Ha miltonian 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 experimental ly is reproduced. A semiclassical micromagnetic spin wave theory is pr esented and used to calculate the dispersion curves and amplitude spec tra of the multilayers at various values of the external field. It is found that uniform precession dominates all in-plane modes, and that t he features in the FMR absorption curve coincide with the sudden excit ation of the first spin wave mode in the perpendicular direction. (C) 1997 American Institute of Physics.