Anharmonic aspects of magnetomechanical damping

Nonlinear aspects of the magnetization process in vibrating iron are studied by using the harmonics of both acoustic and magnetic coil signals. The prediction of elementary hysteresis theory that the harmonics should all vary as ε2 is borne out to a considerable extent, and some of the exceptions appear to mark the onset of another mechanism of damping at the higher amplitudes. The prediction of only odd harmonics is less well obeyed by these data.