Frequency dependence of low-temperature susceptibility peak in some titanomagnetites

Physics

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Scientific paper

Several members of the titanomagnetite (Fe3 - xTixO4 0 <= x <= 1.0) series have isotropic points (i.e. temperatures at which the first-order magnetocrystalline anisotropy constant K1 = 0), where the initial magnetic susceptibility, χ, attains a peak value. We report here the preliminary results of our study of the χ-T relationship of these materials over the frequency range 13 Hz to 117 kHz. We find that the χ peak of magnetite remains at about 120 K, whereas that of Fe2.8Ti0.2O4 shifts by 58 K over this frequency range. The features of this phenomenon are reported, and its value in distinguishing titanomagnetites is noted.

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