Antiferroelectriclike hysteresis loops in PbTiO3/BiFeO3/PbTiO3 sandwich structural film

PbTiO3/BiFeO3/PbTiO3 sandwich structure has been deposited on Pt/Ti/SiO2/Si substrate by sol-gel method annealing at 600 ∘C. X-ray diffraction analysis revealed that the film was fully crystallized with no impure phase. Antiferroelectriclike hysteresis loop was observed at room temperature under low applied field. Under high applied electric field, ferroelectric hysteresis loop was observed renew. Compared with the BiFeO3 film, the sandwich structural film showed reduced leakage.