Superparamagnetic Phenomenon Research Articles

Superparamagnetism — determination of the diffusion coefficient of the vector of magnetization, of anisotropy energy, and of volume distribution of particles by Mössbauer effect

On the basis of an analysis of experimental NGR data for the recent twelf years and a modelling of different experimental situations correct methods are given of determination of the parameters describing the phenomenon of superparamagnetism. The main feature of the proposed methods is the successive consideration of the transitional field frequencies of relaxation, forms of size distributions, and the type of anisotropy energy wa. wa, the width of size distribution, the most probable volume, and the diffusion coefficient χ of vector M can be determined in the case of ferromagnetic particles with the help of NGR spectra only. The parameters for α-Fe2O3 and Fe(III) gels are given. [Russian Text Ignored].