Abstract
Electrodeposited films of Fe-Pt with a compact morphology, small grain size and low oxygen content have been obtained from a slightly alkaline solution containing Pt2+ diamino-dinitrite and Fe3+ complexed by citrate/glycine. As-deposited films exhibit a FCC structure for Pt-rich compositions, while Fe-rich ones are BCC; all these alloys are magnetically soft. Upon thermal annealing of equiatomic films in forming gas, phase transformation to the ordered tetragonal L10 structure occurs in parallel with magnetic hardening; the temperature for the onset of transformation is lower for thicker films. In particular, for ~100nm thick films, hardening starts at 350¢ªC, and coercivity saturates already at 450¢ªC, yielding values up to 13 kOe. Bilayers comprised of 15nm equiatomic Fe-Pt on top of Fe 75at. % films (5nm to 50nm) facilitate the hardening process in thin films, yielding about 50% increase in coercivity with respect to a single Fe-Pt layer of similar thickness when annealing at 550¢ª-650¢ªC.
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