HIGH-ENERGY PRODUCTS IN RAPIDLY ANNEALED NANOSCALE FE PT MULTILAYERS/

Magnetic properties of nanocomposite Fe-Pt films with Fe concentration higher than 50 at % have been investigated in this study. Fe/Pt multi layers were produced by sputtering and magnetic hardening was observed after heat treatment including rapid annealing. The final nanocomposi te films consisted of the hard face-centered tetragonal FePt phase and a soft face-centered-cubic phase. The maximum energy products of the optimally processed samples exceeded 40 MGOe. Evidence for exchange co upling of the hard and soft phases was found. (C) 1998 American Instit ute of Physics.