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

Abstract

Ferroelectric ${\mathrm{Bi}}_{3.25}{\mathrm{La}}_{0.75}{\mathrm{Ti}}_3{\mathrm{O}}_{12}$ (BLT) thin films were deposited on $\mathrm{Pt}∕\mathrm{Ti}∕\mathrm{Si}{\mathrm{O}}_2∕\mathrm{Si}$ substrates by the polymeric precursor method. The films present $c$ -axis preferred orientation after annealing at $700°\mathrm{C}$ for $2\mathrm{h}$ in conventional furnace. All the capacitors showed good polarization fatigue characteristics at least up to $1\times {10}^{10}$ bipolar pulse cycles and excellent retention properties up to $1\times {10}^4\mathrm{s}$ . 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 $10\mathrm{s}$ .