56721 20200221144247.0 doi 10.1021/acs.nanolett.5b04455 sideral 94469 ART-2016-94469 eng (orcid)0000-0003-0885-9541 Guzmán, Roger Polar-Graded Multiferroic SrMnO3 Thin Films 2016 Access copy available to the general public Unrestricted Engineering defects and strains in oxides provides a promising route for the quest of thin film materials with coexisting ferroic orders, multiferroics, with efficient magnetoelectric coupling at room temperature. Precise control of the strain gradient would enable custom tailoring of the multiferroic properties but presently remains challenging. Here we explore the existence of a polar-graded state in epitaxially strained antiferromagnetic SrMnO3 thin films, whose polar nature was predicted theoretically and recently demonstrated experimentally. By means of aberration-corrected scanning transmission electron microscopy we map the polar rotation of the ferroelectric polarization with atomic resolution, both far from and near the domain walls, and find flexoelectricity resulting from vertical strain gradients. The origin of this particular strain state is a gradual distribution of oxygen vacancies across the film thickness, according to electron energy loss spectroscopy. Herein we present a chemistry-mediated route to induce polar rotations in oxygen-deficient multiferroic films, resulting in flexoelectric polar rotations and with potentially enhanced piezoelectricity. info:eu-repo/grantAgreement/ES/MINECO/MAT2014-51982-C2 info:eu-repo/grantAgreement/EC/FP7/312483/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM 2 info:eu-repo/grantAgreement/EC/FP7/239739/EU/Under the light of electrons/STEMOX info:eu-repo/grantAgreement/ES/DGA/E26-304043 info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 12.712 2016 CHEMISTRY, PHYSICAL 7 / 145 = 0.048 2016 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 11 / 275 = 0.04 2016 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 5 / 87 = 0.057 2016 Q1 T1 PHYSICS, CONDENSED MATTER 7 / 67 = 0.104 2016 Q1 T1 CHEMISTRY, MULTIDISCIPLINARY 11 / 166 = 0.066 2016 Q1 T1 PHYSICS, APPLIED 7 / 147 = 0.048 2016 Q1 T1 7.892 2016 Bioengineering 2016 Q1 Chemistry (miscellaneous) 2016 Q1 Nanoscience and Nanotechnology 2016 Q1 Materials Science (miscellaneous) 2016 Q1 Mechanical Engineering 2016 Q1 Condensed Matter Physics 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-6487-1505 Maurel, Laura Universidad de Zaragoza (orcid)0000-0002-6944-4713 Langenberg, Eric Lupini, Andrew R. (orcid)0000-0002-4698-3378 Algarabel, Pedro A. Universidad de Zaragoza (orcid)0000-0002-0111-8284 Pardo, José A. Universidad de Zaragoza (orcid)0000-0002-6761-6171 Magén, César Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 16, 4 (2016), 2221-2227 Nano lett. Nano Letters 1530-6984 3165569 http://zaguan.unizar.es/record/56721/files/texto_completo.pdf Postprint 71634 http://zaguan.unizar.es/record/56721/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:56721 articulos driver 2020-02-21-13:25:40 ARTICLE