Magnetism of Piezoelectric Ga2−xFexO3

Abstract

The magnetic moments and susceptibilities of the piezoelectric‐ferromagnetic compounds Ga2−x Fe x O3 have been measured over a temperature range from 4.2° to 350°K. The saturation moment at 0°K and the Curie temperature follow a linear compositional relationship. The magnetic properties of these compounds are sensitive to heat treatment. In the vicinity of the Curie temperature, the magnetization follows a (Tc−T)2 law. At low temperatures, the deviation in the magnetization follows an exponential of the form exp (−98.8°K/T). In the paramagnetic region, the Curie constants for these substances differ radically from values expected for an ensemble of S state ferric ions. From the experiments reported here, it seems that one must assume in these compounds that the ferric ions have an exceedingly strong local crystalline interaction.