Power flow and energy distribution of magnetostatic bulk waves—In dielectric-layered structure

Abstract

This paper presents a theoretical investigation of guided propagation of the magnetostatic bulk waves in a normally magnetized ferrite film separated from a perfect conductor by a dielectric layer. Starting from the generalized Poynting theorem for dispersive media, the expressions for time-averaged power flow and energy density have been obtained in the magnetostatic approximation. The velocity of time-averaged energy flow has been shown to be equal to the group velocity, which establishes the consistency of magnetostatic approximation from the energy point of view.