Abstract
To study the Mössbauer spectra of single-domain particles the full description of superparamagnetic relaxation as a diffusion process is applied. It is shown that the fluctuations of magnetic moment around the easy axes (collective magnetic excitations) play a crucial role in the relaxation behaviour of the spectra. For instance the slow fluctuations in low-dissipative magnetic particles should be followed by very broad and asymmetrical shape of hyperfine structure in Mössbauer spectra that has much in common with frequently observed anomalies.
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Sedov, V.E. Diffusion model of superparamagnetic relaxation. Hyperfine Interact 56, 1491–1494 (1990). https://doi.org/10.1007/BF02405464
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DOI: https://doi.org/10.1007/BF02405464