Structure, Magnetic Properties, and Phase Transformations in Electrodeposited Fe-Rich Fe–Pt Films

Abstract

Fe rich Fe-Pt films with 56 to 75 at.% Fe are electrodeposited from an alkaline solution. A FCC (111) texture is clearly observed for as-deposited films with less than 62 at. % Fe, while a BCC (110) orientation is seen for higher Fe fraction. After annealing in forming gas for one hour at or above 400C, a transformation to a face centered tetragonal FCT L1 0 phase was observed below 62 Fe at.%. With increasing Fe content, the annealed films show a texture change from (200) to (002); films with less than 72% Fe show coercivity ~7 kOe while films with Fe above that value show small coercivity.Of particular interest are the 75 at.% films; these show a FCT structure after annealing at or above 450C, which differs from the L1 0 structure and is characterized by low anisotropy; in contrast, a relatively high out of plane coercivity (1-3 kOe) is observed in 75 at. % films in the as-deposited or annealed conditions up to 350C. 0018-9464 (c)