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dc.contributor.authorWang, Zhihong
dc.contributor.authorZhang, Xixiang
dc.contributor.authorWang, Xianbin
dc.contributor.authorYue, Weisheng
dc.contributor.authorLi, Jingqi
dc.contributor.authorMiao, Jianmin
dc.contributor.authorZhu, Weiguang
dc.date.accessioned2015-08-03T09:59:03Z
dc.date.available2015-08-03T09:59:03Z
dc.date.issued2012-08-14
dc.identifier.issn1616301X
dc.identifier.doi10.1002/adfm.201200839
dc.identifier.urihttp://hdl.handle.net/10754/562275
dc.description.abstractThe coupling between dielectric polarization and strain gradient, known as flexoelectricity, becomes significantly large on the micro- and nanoscale. Here, it is shown that giant flexoelectric polarization can reverse remnant ferroelectric polarization in a bent Pb(Zr0.52Ti0.48) O3 (PZT) diaphragm fabricated by micromachining. The polarization induced by the strain gradient and the switching behaviors of the polarization in response to an external electric field are investigated by observing the electromechanical coupling of the diaphragm. The method allows determination of the absolute zero polarization state in a PZT film, which is impossible using other existing methods. Based on the observation of the absolute zero polarization state and the assumption that bending of the diaphragm is the only source of the self-polarization, the upper bound of flexoelectric coefficient of PZT film is calculated to be as large as 2.0 × 10-4 C m -1. The strain gradient induced by bending the diaphragm is measured to be on the order of 102 m-1, three orders of magnitude larger than that obtained in the bulk material. Because of this large strain gradient, the estimated giant flexoelectric polarization in the bent diaphragm is on the same order of magnitude as the normal remnant ferroelectric polarization of PZT film. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.publisherWiley
dc.subjectdiaphragms
dc.subjectferroelectric thin films
dc.subjectflexoelectricity
dc.subjectmicroelectromechanical systems
dc.titleGiant flexoelectric polarization in a micromachined ferroelectric diaphragm
dc.typeArticle
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
dc.contributor.departmentCore Labs
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAdvanced Functional Materials
dc.contributor.institutionSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
dc.contributor.institutionSchool of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
kaust.personWang, Zhihong
kaust.personZhang, Xixiang
kaust.personWang, Xianbin
kaust.personYue, Weisheng
kaust.personLi, Jingqi
dc.date.published-online2012-08-14
dc.date.published-print2013-01-07


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