Use of Magnetostatic Modes as a Research Tool

The use of ferrimagnetic resonance and in particular of the magnetostatic modes of spheres to obtain information on basic physical magnetic parameters is discussed. The effects of random and systematic deviations of the experimental situation from the theoretical upon the determination of $\text{4πM}$ , $\gamma$ , and the magnetic anisotropy constants are treated. A summary is also given of the use of line width and rf power saturation measurements on the magnetostatic modes to obtain information on the spin-wave spectrum of the material.