Loss Mechanisms in Spinel Ferrites

Abstract

New data on ferrimagnetic resonance linewidth at 9200 Mc/sec in a ferrite of composition ${(\mathrm{NiO})}_{{0.75}^{\ensuremath{-}}}$ ${(\mathrm{FeO})}_{0.25}$${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$ are presented. These data are compared with earlier observations of ferrimagnetic resonance linewidth at 24 000 Mc/sec on the same material in order to distinguish between two theoretical analyses of the mechanism of loss involved.