Nanoscale Observation of Poling Behaviors in Nd-Substituted Bi4Ti3O12 Ferroelectric Thin Films

作者：Shin Ran Hee^*; Lee Ji Hye; Kim Gracia; Jo William; Kim Dae Hyun; Lee Hyun Jin; Kang Jeongsoo

来源：Japanese Journal of Applied Physics, 2010, 49(9): 091501.

DOI：10.1143/JJAP.49.091501

In this study, the effects of oxygen vacancies on the local poling properties of Bi-layered ferroelectric thin films were examined. Bi3.15Nd0.85Ti3O12 (BNT) thin films were coated on Pt(111)/Ti/SiO2/Si substrates using a sol-gel method. An oxygen vacancy of 2.4 +/- 0.5% was observed mainly at the Bi2O22+ layers in the film that annealed in an oxygen-deficient atmosphere. The film containing oxygen vacancies showed a shift in the polarization-electric field hysteresis loop. Contact-mode electrostatic force microscopy revealed a domain pinning behavior in the BNT film with oxygen vacancies. The unpolarized domains were explained by the built-in field formed by the oxygen vacancies in the Bi2O22+ layers.

• 出版日期2010