Magnetic Rotation Phenomena in a Polycrystalline Ferrite

Abstract

In order to calculate the initial susceptibility at high frequencies of a polycrystalline sample of ferrite, one must take account of the interaction between neighboring crystallites, and of the fact that the crystallites differ from each other in their orientation (assumed random) and in their characteristic resonant frequencies. Each crystallite is acted upon by an oblique alternating field, and its magnetization processes in an elliptical cone. A simple solution of this problem is given by the use of complex variables involving two different imaginaries. It is found that the interaction between crystallites has little effect on the magnetic spectrum other than to raise the effective value of the resonant frequencies, and that the spectrum obtained is not very sensitive to the exact form chosen for the distribution of resonant frequencies among the crystallites.