GREBENNIKOV V.I., GUDIN S.A.
The manner in which thermal fluctuations of the electron spin density affect the magnetic, thermodynamic, and spectroscopic properties of the transition metals is investigated using a unified approach. The magnetization, susceptibility, and heat capacity of Fe, Co, and Ni are calculated on the basis of the dynamic spatial spin fluctuation theory developed by the authors  and other approximate methods of fluctuation description. The contributions made by the various physical mechanisms to the temperature dependences of the observed quantities are assessed. The self-consistent dynamic spatial spin fluctuation theory is shown to yield not only a quantitative but also a good quantitative description of how the properties of ferromagnetic materials vary with temperature over the entire temperature range, including the phase transition to the paramagnetic state.