Negative Magnetoresistance of Ferromagnetic Metals due to Spin Fluctuations

Abstract

The magnetoresistance of ferromagnetic metals due to spin fluctuation through s-d interaction is calculated for the whole temperature region and for the weak magnetic field. The ladder approximation (RPA) is used in the calculation of the spin Green's functions and it is shown that the magnetoresistance has a logarithmic dependence on the temperature and the magnetic field both at low temperatures and near the transition temperature.