Ferromagnetic Resonance in Polycrystalline Ferrites with Hexagonal Crystal Structure

Abstract

A theory is developed for the shape of the ferromagnetic resonance line of polycrystalline ferrites with hexagonal crystal structure. The theory is applicable if the anisotropy field is much larger then the saturation magnetization. It predicts the occurrence of several absorption peaks whose locations and intensities depend on the magnitudes of the various anisotropy constants. For intermediate values of the anisotropy constants two absorption peaks should occur on the low‐field side of $\mathrm{\omega /\gamma }$ if $K_1\text{<0}$ ; one peak should occur on each side of $\mathrm{\omega /\gamma }$ if $K_1\text{>0}$ . Experimental results on various hexagonal compounds are in good qualitative agreement with the theory.