Flexoelectricity in barium strontium titanate thin film

Seol Ryung Kwon, Wenbin Huang, Longlong Shu, Fuh Gwo Yuan, Jon Paul Maria, Xiaoning Jiang

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

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-μC/m at Curie temperature (∼28 °C) and 17.44-μC/m at 41 °C. The measured flexoelectric coefficients are comparable to that of bulk BST ceramics, which are reported to be 10-100-μC/m. This result suggests that the flexoelectric thin film structures can be effectively used for micro/nano-sensing devices.

Original languageEnglish (US)
Article number142904
JournalApplied Physics Letters
Volume105
Issue number14
DOIs
StatePublished - Oct 6 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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