Improved ferroelectric, dielectric and magnetic properties with La- and Mn- doped Bi5Ti3FeO15 thin films

A series of La and Mn co-doped Bi5Ti3FeO15 (BLTFMO) thin films were prepared by spin-coating deposition route. X-ray diffraction, atomic force microscopy and scanning electron microscopy were used to characterize the structures of these BLTFMO thin films. Ferromagnetic properties are obtained as the La-doping content is 0, 0.1, 0.2, and 0.3 with the transition temperature of 127.2 K, 65.1 K, 48.1 K, and 7.9 K, respectively. Well-defined ferroelectric loops are found in all these BLTFMO films, and a higher remnant polarization of 27.84, 24.21 and 24.02 μC/cm2 is obtained in the 0.1, 0.2 and 0.3 La-doped films, respectively. A weak dielectric dispersion for the BLTFMO without La-doping, a strong one in 0.1, 0.2, 0.3 and 0.4 La doped films as indicated by the appearance of a dielectric loss peak, and a weak dispersion in 0.6, 0.8 and 1 La doped ones are demonstrated. [Display omitted] •A series of La and Mn doped Aurivillius BTFO are prepared by a spin-coating route.•Ferromagnetic properties are yielded when La-doping content is 0, 0.1, 0.2 and 0.3.•Tc decreases from 127.2 K to 7.9 K when La-doping content rises from 0 to 0.3.•Well-defined P-E loops are achieved in all these La and Mn doped BTFO films.•Larger Pr of 27.8, 24.2 and 24 μC/cm2 is found in 0.1, 0.2 and 0.3 La-doped BTFMO.