Abstract
The parameters of the log‐normal size distribution of a MnFe2O4 ferrofluid powder sample have been determined by X‐ray diffraction. The mean blocking temperature was determined from the maximum of Xi . Mössbauer spectra at 4.2–300 K are interpreted by a new simple theory of superparamagnetism and taking a reduction of the internal magnetic field for small particles, a size dependence of the anisotropy constant, the size distribution and collective excitations into account.
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Pfannes, H., Dias Filho, J., López, J. et al. Study of ferrofluids by Mössbauer spectroscopy. Hyperfine Interactions 113, 507–515 (1998). https://doi.org/10.1023/A:1012616909485
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DOI: https://doi.org/10.1023/A:1012616909485