Improved dielectric and ferroelectric properties in Ti-doped BiFeO3–PbTiO3 thin films prepared by pulsed laser deposition

Ti-modified thin films of multiferroic 0.72Bi(Fe1 − xTix)O3–0.28PbTiO3 (BFPT, x = 0 and 0.02) solid solution were prepared by pulsed laser deposition. The BFPT (x = 0 and 0.02) films possess a tetragonal structure with highly preferential (001) orientation. The effects of the ionic substitution on the properties of BFPT (x = 0 and 0.02) films have been investigated. The leakage current of the BFPT (x = 0.02) thin film is significantly reduced, and the dielectric and ferroelectric properties greatly improved by the aliovalent ionic substitution of Ti4+ for Fe3+. The BFPT (x = 0.02) thin film exhibits a reasonably high remnant polarization Pr with 2Pr up to 90 μC/cm2 at 312 kV/cm and a switchable polarization up to 92 μC/cm2 at 417 kV/cm.