Molecular Field Fluctuation Effects in Mixed Nickel-Zinc Ferrites

Abstract

The concept of molecular field fluctuations is utilized to discuss the thermal variation of the magnetic moment and the heat capacity of some mixed nickel-zinc ferrites. Experimental data on the magnetic moment are shown. It is concluded that for material with large molecular field fluctuations the concept of a single Curie temperature becomes meaningless. For the same reason, the absence of heat capacity evidence of triangular configuration transitions does not necessarily invalidate the theory for nickel-zinc ferrites.