The initial magnetic permeability spectra of single-crystal manganese-zinc ferrite and two titanomagnetites were measured at audio frequencies from room temperature down to 10 K. The observed maxima in the magnetic loss factor can be ascribed to the passing of the anisotropy constant through zero and to the relaxation processes connected with the presence of charge carriers in the octahedral sites of the spinel lattice. The hopping of electrons of Fe/sup 2+/ and Fe/sup 3+/ in octahedral positions is responsible for the relaxation mechanism.
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