Enhanced multiferroic and dielectric properties of Sr2+-doped BiFe0.94(Mn0.04Cr0.02)O3 thin films

Abstract

Sr 2? -doped B 1-x Sr x Fe 0.94 (Mn 0.04 Cr 0.02 )O 3 (B 1-x Sr x FMC, x = 0.00, 0.05 and 0.09) thin films were prepared on FTO/glass (SnO 2 : F) substrates by using a sol-gel spin-coating method. X-ray diffraction (XRD), Rietveld refined XRD data and Raman scattering spectra illustrate a structural evolution from trigonal (R3c: H) to tetragonal (P4) occurs in B 1-x Sr x FMC thin films with the increase of Sr 2? concent. Superiorly multiferroic and dielectric properties were obtained in the B 1-x Sr x FMC thin films, e.g., large remanent polarization value, a high dielectric constant (P r = 139.21 lC/cm 2 and e r = 396.7 for x = 0.09) and large saturation magnetization (M s = 2.08 emu/cm 3 for x = 0.05). The leakage current density of B 1-x Sr x FMC thin films is increased with increasing Sr 2? concentration, wherein the leakage current density of all the B 1-x Sr x FMC films is of the order of magnitude of 10 -5 A/cm 2 , which are still lower than that in the pure BFO film (10 -3 A/ cm 2 ).