Large growth-induced anisotropy to preferential occupation of the iron sites in garnets

Abstract

Large growth‐induced anisotropies (K_u) arising from the preferential occupation of Ir⁴⁺ on octahedral sites have been measured. For YIG with approximately 0.2 Ir atoms per garnet formula unit and Mg²⁺ as a charge compensator, values of K_u=+4.5×10⁵ ergs/cm³ have been obtained. The induced anisotropy is proportional to the Ir⁴⁺ present as deduced from the optical absorption.