Some fundamentals of Mössbauer spectroscopy and of fluctuating magnetic hyperfine interactions are reviewed. An expression for calculation of spin-phonon interaction transition probabilities on the ground of a Debye model is given. Basic ideas of superparamagnetism and classical results for low-temperature relaxation rates are presented. A theory of superparamagnetism based on spin-phonon interaction is introduced. It is shown how to calculate from this Mössbauer spectra taking all spin-levels into account. Experimental spectra of ferrofluids are compared with simulated spectra and found in good accordance.
CITATION STYLE
Pfannes, H. D., Dias Filho, J. H., Magalhães-Paniago, R., López, J. L., & Paniago, R. (2001). Mössbauer spectroscopy, superparamagnetism and ferrofluids. Brazilian Journal of Physics, 31(3), 409–417. https://doi.org/10.1590/S0103-97332001000300011
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