A HAMILTONIAN DESCRIPTION OF FMR IN FINITE CONTINUOUS MEDIA

A Hamiltonian dynamical framework is applied to the ferromagnetic reso nance of finite, continuous distributions of magnetisation in media wh ich evolve via non-uniform magnetisation processes. The theory takes i nto account the cooperative motion of the coupled moments of the syste m and is applied to regularly shaped two-dimensional platelets under t he influence of in-plane bias fields and small transverse dynamic pert urbations. Resonance spectra are obtained showing a significant broade ning of the linewidth over that expected for systems with independent moments.