Electron Critical Scattering in EuS-In Ferromagnetic Tunnel Junctions

Abstract

We have observed a Curie-Weiss temperature dependence for electron critical scattering in In-EuS junctions which applies to within a few degrees of the ordering temperature $T_c$. The law holds both above and below $T_c$ from 4.2 to 300°K. Above $T_c$ the magnetoconductance is $G(H,T)=G_0(T-T_c)+G_{1}T{H}^2{(T-T_c)}^{-2\mathrm{}}$, where $G_0$ and $G_1$ are constants. These results are explained by a model based on critical scattering in the mean-field limit.