Microwave Resonance Relations in Anisotropic Single-Crystal Ferrites

The ferromagnetic resonance relations in magnetically anisotropic single-crystal ferrites have been re-examined. Detailed analyses are presented for spherical ferrite specimens possessing first order anisotropy. Generalized nomograms are presented which relate the microwave resonance frequency to the static magnetic field $H$, the anisotropy parameter $\frac{K}{M}$, and the static field orientation angle. These curves are derived for both negative and positive anisotropy specimens with H lying in a (110) crystal plane.