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Oxygen-vacancy engineering in strained multiferroic SrMnO3 thin films

AuthorsMaurel, Laura; Langenberg, Eric; Guzmán, Roger ; Magen, Cesar; Algarabel, Pedro A. ; Pardo, J. A.
Issue Date2016
CitationSCTE (2016)
AbstractThe urge to bend conventional rules in developing multiferroic materials with strong magnetoelectric coupling, has been partially solved by strain engineering. Among these novel strain-induced multiferroic materials, SrMnO3 was proposed as an optimal candidate as strain promotes the polar distortion and associated off-centring of the magnetic Mn atoms. The prediction of the polar instability under strain was successfully verified and shown to be concomitant with the emergence of conduction domains. However, the properties of these thin films not only depend on the imposed strain but also on the mechanism to accommodate the in-plane lattice parameter, where off-stoichiometry is as additional mechanism besides the widely-known modification of the bond lengths or the octahedral tilt patterns in stoichiometric perovskites. Here, we show experimental evidence for the previously proposed increase of the oxygen vacancy content on increasing tensile epitaxial strain. Furthermore, a novel dependence of the oxygen stoichiometry on the thickness of the films has been found, allowing to control the amount of these defects by both the applied strain and the film thickness. In these films, the Poisson’s ratio has been experimentally obtained lower than in other manganites. Density functional theory calculations confirm the low Poisson's ratio for both stoichiometric SrMnO3 and films containing oxygen vacancies. The control of the content of oxygen vacancies in magnetoelectric materials opens new routes to induce unexpected properties in strained thin films.
DescriptionResumen del trabajo presentado a la 20th International Conference on Solid Compounds of Transition Elements, celebrada del 11 al 15 de abril de 2016 en Zaragoza (España).
Appears in Collections:(ICMA) Comunicaciones congresos
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