Modified Equation of Motion Approach for Ferromagnetic Systems

The key problem in using the dynamical meaneld theory is nding the appropriate solution to the single impurity Anderson model. We use the modi ed equation of motion method based on di erentiation over two time variables. In such approach we obtain correct description of the Kondo e ect not only for systems symmetrical with respect to the halflled point but also for the systems without symmetry in a half lled point and for broad range of electron concentrations like e.g. the ferromagnetic systems. For the reason of these advantages we investigate in this report dependence of the system magnetic moment on carrier concentration using our modi ed equation of motion method. We also analyze in uence of asymmetric densities of states on ferromagnetic alignment. Our results are compared with dynamical meaneld theory quantum Monte Carlo calculations and with Hubbard I and III approximations.