Anisotropy and magnetostriction of ruthenium-substituted lithium ferrite and nickel ferrite

Abstract

The growth of ruthenium‐substituted lithium ferrite and nickel ferrite single crystals from a PbO/B2O3 and a Na2Mo2O7 flux, respectively, was investigated. Anisotropy and magnetostriction measurements have been performed by means of ferromagnetic resonance between 4.2 and 500 K. For the ordered lithium ferrite the anisotropy contributions of the ruthenium ions turn out to be ΔK1 1.5 cm−1/ion and ΔK2 −16 cm−1/ion at 77K. In the case of nickel ferrite ΔK1 and ΔK2 were found to be −13 and −18 cm−1/ion, respectively. The magnetostrictive effects are rather low.