Enhanced ferroelectric and dielectric properties in (La0.7Ca0.3)MnO3-buffered (Bi0.5Na0.5)TiO3-based lead-free thin film by pulsed laser deposition

► LCMO was introduced to promote the crystalline and growth of BNBMT film. ► Large remnant polarization (∼20μC/cm2) comparable to the bulk one was obtained. ► Low dielectric loss was obtained. Mn-doped 0.935(Bi0.5Na0.5)TiO3–0.065BaTiO3 (BNBMT) thin film with a composition near the morphotropic phase boundary was grown on Pt/Ti/SiO2/Si substrates by using pulsed laser deposition. It was found that the presence of a buffer layer of (La0.7Ca0.3)MnO3 promoted growth of (110)-oriented thin film instead of (100) one. Enhanced ferroelectric properties were obtained for the bilayered film, with remnant polarization Pr of ∼20μC/cm2 and coercive field Ec of ∼10.2kV/mm. Dielectric loss was about 0.10 between 100Hz and 100kHz. The enhanced electrical properties exhibit potential in environmental-friendly ferroelectric devices.