Electrical Resistance of Ferromagnetic Metals

In ferromagnetic metals an anomalous electrical · resistance is observed which is characteristic of the magnetization. and is additive to the ordinary electrical resistance. The origin of this anomalous electrical resistance has been discussed by several authors, but all such attempts do not seem to have satisfactorily explained · this phenomenon either quantitatively or qualitatively. In this paper we calculate the anomalous electrical resistance from the standpoint of s-d interac-tion as developed by the author. It is our opinion that the anomalous electrical resistance occurs because the exchange energy between the conduction and the unfilled inner shell electrons depends on the relative direction of the spins of the electrons, and that this interaction is not periodic in finite temperatures. In numerical values as well as in the temperature dependence, our results are in good agreement with experimental results.