Scaling of ferroelectric and piezoelectric properties in Pt/SrBi2Ta2O9/Pt thin films

Scaling of the ferroelectric and piezoelectric properties in Pt/SrBi2Ta2O9/Pt thin films was studied. Focused ion beam milling was used to fabricate submicron devices (1×1, 0.5×0.5, 0.25×0.25, 0.09×0.09, and 0.07×0.07 μm2) and scanning force microscopy was used to examine their piezoelectric response. It was found that capacitors as small as 0.09×0.09 μm2 exhibit good piezoelectric/ferroelectric properties and that submicron (0.25×0.25 μm2) capacitors show resistance to bipolar fatigue with up to at least 109 cycles. The results were compared with similar capacitor structures milled in the Pb1.0(Nb0.04Zr0.28Ti0.68)O3 system where structures as small as 0.07×0.07 μm2 were analyzed.