Dispersion and absorption in ferromagnetic semiconductors

A broad-band spectral analysis was undertaken of the dielectric properties of ferrites (polarization, magnetization and conduction) from d.c. to the optical spectral region. After a short description of the various measurement techniques employed, characteristic data are given of electronic conduction, space-charge polarization, infrared absorption, and ferromagnetic resonance. Various additional resonance and relaxation effects are discussed, which, in addition, may shape the very complicated frequency-response characteristics. The effect of structure and cation distribution of the ferromagnetic semiconductors on the electric and magnetic properties are also considered.