Simulation of Electromagnetic Wave Propagation in Magnetic Randomly Inhomogeneous Magnetic Media

This letter presents an algorithm for numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the finite differences in the time domain (FDTD) method. The algorithm is suitable for analyzing the main timing characteristics, as well as for identifying the features of the propagation of various types of signals in both time-independent and time-dependent, layered, randomly inhomogeneous media. Simulation was carried out of the propagation of the sine pulse, sine signal, and square wave in time-independent magnetic randomly inhomogeneous media with various levels of phase contrast of two types: with a “diffuse” distribution of inhomogeneities and their “close packing.” The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.