Ferroelectrics as smart mechanical materials
Cordero Edwards, Rohini Kumara (Institut Català de Nanociència i Nanotecnologia)
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
Abdollahi, Amir (Universitat Politècnica de Catalunya. Laboratori de Càlcul Numèric)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)

Date:	2017
Abstract:	The mechanical properties of materials are insensitive to space inversion, even when they are crystallographically asymmetric. In practice, this means that turning a piezoelectric crystal upside down or switching the polarization of a ferroelectric should not change its mechanical response. Strain gradients, however, introduce an additional source of asymmetry that has mechanical consequences. Using nanoindentation and contact-resonance force microscopy, this study demonstrates that the mechanical response to indentation of a uniaxial ferroelectric (LiNbO₃) does change when its polarity is switched, and use this mechanical asymmetry both to quantify its flexoelectricity and to mechanically read the sign of its ferroelectric domains.
Grants:	European Commission 308023 Ministerio de Economía y Competitividad FIS2015-73932-JIN Ministerio de Economía y Competitividad MAT2014-57960-C3-1-R Ministerio de Economía y Competitividad FIS2013-48668-C2-1-P Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1216 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Ferroelectricity ; Ferroelectric memories ; Flexoelectricity ; Mechanical properties ; Mechanical reading polarity
Published in:	Advanced materials, Vol. 29, issue 37 (Oct. 2017) , art. 1702210, ISSN 1521-4095

DOI: 10.1002/adma.201702210

Post-print 22 p, 2.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles