Inelastic neutron scattering has been used to study the dynamics of a dispersion of fine Fe particles (diameter ∼ 20 Å) on the time scale of 10 -10 -10 -11 s. It gives the first experimental evidence of a dual dynamics in zero field corresponding to a relaxation time (longitudinal) and to a fluctuation one (semi-transverse) at low temperature, merging in an isotropic regime at high temperature. In this isotropic regime, the fluctuation time appears limited to a temperature-independent value which could be related to the anisotropy energy of the particle.
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Hennion et al. (1994) studied this question.
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