Magnetic-Anisotropy and Magnetostriction Constants of Substituted Lithium Ferrites at 300°K

Abstract

Room‐temperature measurements of magnetic‐anisotropy constants K₁ and K₂ and magnetostriction constants λ₁₀₀ and λ₁₁₁ on single‐crystal lithium ferrites containing Al, Ti, Ga, Zn, In, Co, and Mn have been carried out by means of ferrimagnetic‐resonance techniques at 5.8 GHz. From the measurements of K₁, it appears that only cobalt has a significant effect on anisotropy, in accord with earlier works on other spinels. From the magnetostriction measurements, it is concluded that manganese has a significant effect on λ₁₀₀ and λ₁₁₁, where changes in the signs of both constants occur as the amount of substitution is increased. This effect of manganese substitutions is shown to also exist in the yttrium‐iron garnet system.