Electrical Resistance of Ferromagnetic Metals

Abstract

We use a model for ferromagnets such that the electrical current is carried by 4s (or 6s) electrons which are assumed to be described in band scheme and the unpaired electrons (3d or 4f) are assumed to be localized on the lattice points. In the temperature region far below the Curie point the spin-disorder in spin orientation, which can be naturally described in terms of spin waves, gives rise to the scattering of conduction electrons through the s-d interaction and accordingly contributes to the anomalous part of the resistivity of type T2, which agrees fairly well with the experimental results both in order of magnitude and in temperature dependence. The effects of the lattice vibration are also discussed and turn out to give only the small additional contribution of type T5.