Multiferroic properties of Co and Nd co-substituted Bi5Ti3FeO15 thin films

Abstract Co and Nd co-substituted Bi 5 Ti 3 FeO 15 thin films were prepared on Pt/Ti/SiO 2 /Si substrates via metal organic decomposition method. The structural and multiferroic properties of the films were investigated. It was found that Co ions enter into the lattice and occupy the Fe site. The Bi 4.15 Nd 0.85 Ti 3 Fe 0.5 Co 0.5 O 15 films simultaneously exhibit ferroelectric and ferromagnetic properties at room temperature, and its 2 P r and 2 M r are 38 μC/cm 2 and 3 kA/m, respectively. Moreover, substitutions create local ferromagnetic order and antiferromagnetic order depending on whether the local bonding is Fe O Co or Fe O Fe/Co O Co, respectively. The competing interaction of the ferromagnetic and antiferromagnetic phases results in an interesting magnetic behavior of the films.