Current-induced switching in the orientation of magnetic moments is observe
d in cobalt/copper/cobalt sandwich structures, for currents flowing perpend
icularly through the Layers. Magnetic domains in adjacent cobalt layers can
be manipulated controllably between stable parallel and antiparallel confi
gurations by applying current pulses of the appropriate sign. The observati
ons are in accord with predictions that a spin-polarized current exerts a t
orque at the interface between a magnetic and nonmagnetic metal, due to Loc
al exchange interactions between conduction electrons and the magnetic mome
nts.