Relation Between Crystallite Orientation and Magnetic Properties of Elongated Single-Domain Iron Particles

Abstract

Analysis by selected area electron diffraction of aligned elongated single‐domain iron particles, each about 150 A by 500 A, indicates that the long axis of the particle is coincident with the [111] crystallographic direction. Diffuse diffraction rings and elongated spots were attributed to a considerable degree of random crystallite orientation. These results confirm predictions based on particle morphology and on the temperature coefficient of coercive force of iron and iron‐cobalt alloy particles. This [111] orientation offers an explanation for the increase in coercive force with increase in temperature observed for single domain iron‐cobalt alloy particles and suggests a related explanation for the Alnico type alloys.