We have developed a method for producing metal nanoparticulate thin film composites by electrochemical deposition.  These materials are composed of a metal matrix embedded with nanoscale oxide particles.  A rotating disk electrode is used to deposit the matrix metal from an electrolytic solution containing a suspension of the oxide nanoparticles. The volume fraction of the oxide can be sensitively adjusted by controlling the current density, density of the oxide in the electrolyte, and rotation rate of the disk electrode.  Currently we are using this method to produce FeCo-based nanocomposites that display enhanced hardness and creep resistance while retaining the soft magnetic properties of the bulk alloy.