Retention characteristics in Bi3.25La0.75Ti3O12 thin films prepared by the polymeric precursor method

Ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films were deposited on Pt∕Ti∕SiO2∕Si substrates by the polymeric precursor method. The films present c-axis preferred orientation after annealing at 700°C for 2h in conventional furnace. All the capacitors showed good polarization fatigue characteristics at least up to 1×1010 bipolar pulse cycles and excellent retention properties up to 1×104s. We found that the polarization loss is insignificant with five write∕read voltages at a waiting time of 10 000 S. Independently of the applied electric field the retained switchable polarization approached a nearly steady-state value after a retention time of 10s.