106648 20230519145408.0 doi 10.1021/acsomega.1c00953 sideral 124476 ART-2021-124476 eng Langenberg, Eric (orcid)0000-0002-6944-4713 Relaxation Mechanisms and Strain-Controlled Oxygen Vacancies in Epitaxial SrMnO3 Films 2021 Access copy available to the general public Unrestricted : SrMnO3 has a rich epitaxial strain-dependent ferroic phase diagram, in which a variety of magnetic orderings, even ferroelectricity, and thus multiferroicity, are accessible by gradually modifying the strain. Different relaxation processes, though, including the presence of strain-induced oxygen vacancies, can severely curtail the possibility of stabilizing these ferroic phases. Here, we report on a thorough investigation of the strain relaxation mechanisms in SrMnO3 films grown on several substrates imposing varying degrees of strain from slightly compressive (−0.39%) to largely tensile ≈+3.8%. First, we determine the strain dependency of the critical thickness (tc) below which pseudomorphic growth is obtained. Second, the mechanisms of stress relaxation are elucidated, revealing that misfit dislocations and stacking faults accommodate the strain above tc. Yet, even for films thicker than tc, the atomic monolayers below tc are proved to remain fully coherent. Therefore, multiferroicity may also emerge even in films that appear to be partially relaxed. Last, we demonstrate that fully coherent films with the same thickness present a lower oxygen content for increasing tensile mismatch with the substrate. This behavior proves the coupling between the formation of oxygen vacancies and epitaxial strain, in agreement with first-principles calculations, enabling the strain control of the Mn3+/Mn4+ ratio, which strongly affects the magnetic and electrical properties. However, the presence of oxygen vacancies/Mn3+ cations reduces the effective epitaxial strain in the SrMnO3 films and, thus, the accessibility to the strain-induced multiferroic phase. info:eu-repo/grantAgreement/ES/DGA/E13-20R info:eu-repo/grantAgreement/ES/DGA/E28-20R info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3 This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 823717-ESTEEM3 info:eu-repo/grantAgreement/ES/MICINN/MAT2017-82970-C2-1-R info:eu-repo/grantAgreement/ES/MICINN/MAT2017-82970-C2-2-R info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 4.132 2021 CHEMISTRY, MULTIDISCIPLINARY 73 / 180 = 0.406 2021 Q2 T2 0.708 2021 Chemistry (miscellaneous) 2021 Q1 Chemical Engineering (miscellaneous) 2021 Q1 5.2 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Maurel, Laura Antorrena, Guillermo (orcid)0000-0001-5661-7964 Algarabel, Pedro A. (orcid)0000-0002-4698-3378 Magén, César Universidad de Zaragoza (orcid)0000-0002-6761-6171 Pardo, José A. Universidad de Zaragoza (orcid)0000-0002-0111-8284 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. 6, 20 (2021), 13144–13152 ACS Omega ACS OMEGA 2470-1343 4364904 http://zaguan.unizar.es/record/106648/files/texto_completo.pdf Versión publicada 3310642 http://zaguan.unizar.es/record/106648/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:106648 articulos driver 2023-05-18-13:51:55 ARTICLE