Abstract
The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mössbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies.
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Original Russian Text © D.A. Balaev, A.A. Krasikov, S.V. Stolyar, R.S. Iskhakov, V.P. Ladygina, R.N. Yaroslavtsev, O.A. Bayukov, A.M. Vorotynov, M.N. Volochaev, A.A. Dubrovskiy, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 9, pp. 1724–1732.
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Balaev, D.A., Krasikov, A.A., Stolyar, S.V. et al. Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing. Phys. Solid State 58, 1782–1791 (2016). https://doi.org/10.1134/S1063783416090092
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DOI: https://doi.org/10.1134/S1063783416090092