Direct Observation of the Electronic Mean Free Path in Metallic Systems

Abstract

Conduction electrons injected from a ferromagnet $F$ into a normal metal $M$ can be experimentally distinguished from the intrinsic conduction electrons of $M$. They contribute to the anomalous Hall conductance in $M$, which allows a direct observations of their propagation in $M$. I develop a theory of this effect and apply this new method to quench-condensed In.