The investigation of (Bi,La)(Ga,Fe)O3–PbTiO3 thin film prepared by PLD technique

In this report, (Bi,La)(Ga,Fe)O3–PbTiO3 (BLGF–PT) thin film was prepared on platinum coated Si wafer by pulsed laser deposition (PLD) method. BLGF–PT ceramic with morphotropic phase boundary (MPB) composition was used as the PLD target. The spot of Bi2Fe4O9 impurity phase in X-ray diffraction profile implies a composition deviation in the BLGF–PT thin film from that of target. However, the MPB feature of co-existence of rhombohedral and tetragonal phases remains remarkable in the film. The characterization results of the leakage current and ferroelectric hysteresis loop indicate a desirable insulation in this BLGF–PT thin film. Polarization response by positive-up-negative-down pulse measurement and retention property are further carried out at room temperature to check the intrinsic ferroelectric performance. Moreover, high Curie temperature of 465 °C has been discovered in this BLGF–PT thin film, which may promote the application scope of the thin film.

► BLGF–PT thin film prepared by PLD method exhibits prominent MPB feature.
► Desirable insulation is concluded by the results of leakage current and P–E loops.
► Intrinsic ferroelectric performance is checked by PUND and retention measurements.
► The Curie temperature of the BLGF–PT thin film is discovered to be ∼465 °C.