Spin fluctuations in disordered metallic ferrimagnetic alloys

摘要

We propose a theory for the quantitative description of the thermodynamic, magnetic and electronic properties of disordered alloys of transition and normal metals, for example, the system Fe-Al, as obtained from melting, and in the form of metastable states produced by mechanical grinding. System of itinerant d-electrons with two constants of the intra-atomic exchange interaction is investigated on the basis of the fluctuating field approach. Fundamentally new feature of the system is the presence of several ferrimagnetic states, transitions between them generate a variety of temperature dependences of the magnetic characteristics in disordered alloys. The magnetization vs temperature curves are calculated for the disordered alloy models.