Effects of Au content on the structure and magnetic properties of L10-FePt nanoparticles synthesized by the sol-gel method

(FePt)100Au0 NPs are the coexistence of FCT and FCC phases. However, no hints of FCC phase were found for the (FePt)100−xAux NPs (x=5, 10 and 20), which indicates that addition of gold greatly promotes the FCC to FCT phase transition.