Giant flexoelectric polarization in a micromachined ferroelectric diaphragm

Handle URI:
http://hdl.handle.net/10754/562275
Title:
Giant flexoelectric polarization in a micromachined ferroelectric diaphragm
Authors:
Wang, Zhihong; Zhang, Xixiang ( 0000-0002-3478-6414 ) ; Wang, Xianbin; Yue, Weisheng; Li, Jingqi; Miao, Jianmin; Zhu, Weiguang
Abstract:
The 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.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Core Labs
Publisher:
Wiley
Journal:
Advanced Functional Materials
Issue Date:
14-Aug-2012
DOI:
10.1002/adfm.201200839
Type:
Article
ISSN:
1616301X
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Zhihongen
dc.contributor.authorZhang, Xixiangen
dc.contributor.authorWang, Xianbinen
dc.contributor.authorYue, Weishengen
dc.contributor.authorLi, Jingqien
dc.contributor.authorMiao, Jianminen
dc.contributor.authorZhu, Weiguangen
dc.date.accessioned2015-08-03T09:59:03Zen
dc.date.available2015-08-03T09:59:03Zen
dc.date.issued2012-08-14en
dc.identifier.issn1616301Xen
dc.identifier.doi10.1002/adfm.201200839en
dc.identifier.urihttp://hdl.handle.net/10754/562275en
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.en
dc.publisherWileyen
dc.subjectdiaphragmsen
dc.subjectferroelectric thin filmsen
dc.subjectflexoelectricityen
dc.subjectmicroelectromechanical systemsen
dc.titleGiant flexoelectric polarization in a micromachined ferroelectric diaphragmen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentCore Labsen
dc.identifier.journalAdvanced Functional Materialsen
dc.contributor.institutionSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singaporeen
dc.contributor.institutionSchool of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singaporeen
kaust.authorWang, Zhihongen
kaust.authorZhang, Xixiangen
kaust.authorWang, Xianbinen
kaust.authorYue, Weishengen
kaust.authorLi, Jingqien
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