Flexoelectricity in barium strontium titanate thin film

作者：Kwon Seol Ryung; Huang Wenbin; Shu Longlong; Yuan Fuh Gwo; Maria Jon Paul; Jiang Xiaoning^*

来源：Applied Physics Letters, 2014, 105(14): 142904.

DOI：10.1063/1.4898139

Flexoelectricity, the linear coupling between the strain gradient and the induced electric polarization, has been intensively studied as an alternative to piezoelectricity. Especially, it is of interest to develop flexoelectric devices on micro/nano scales due to the inherent scaling effect of flexoelectric effect. Ba0.7Sr0.3TiO3 thin film with a thickness of 130 nm was fabricated on a silicon wafer using a RF magnetron sputtering process. The flexoelectric coefficients of the prepared thin films were determined experimentally. It was revealed that the thin films possessed a transverse flexoelectric coefficient of 24.5 mu C/m at Curie temperature (similar to 28 degrees C) and 17.44 mu C/m at 41 degrees C. The measured flexoelectric coefficients are comparable to that of bulk BST ceramics, which are reported to be 10-100 mu C/m. This result suggests that the flexoelectric thin film structures can be effectively used for micro/nano-sensing devices.

• 出版日期2014-10-6
• 单位西安交通大学