The authors report charge retention in preferentially (117) oriented and textured c -axis oriented ferroelectric Bi3.25 La0.75 Ti3 O12 thin films by electrostatic force microscopy. Surface charges of the films were observed as a function of time in a selected area which consists of a single-poled region and a reverse-poled region. The highly (117) oriented film shows the extended exponential decay with characteristic scaling exponents, n=1.5-1.6. The preferentially c -axis oriented film shows a remarkable retained behavior regardless of the poling. Decay and retention mechanisms of the regions are explained by space-charge redistribution and trapping of defects in the films.
Bibliographical noteFunding Information:
This work was by a grant (Code No. 06K1501-02520) from “Center for Nanostructured Materials Technology” under “21st Century Frontier R&D Programs” of the Ministry of Science and Technology, Korea.