IMF2017

(Sr,Ba)MnO₃ perovskites are expected to exhibit a strong coupling between electrical polarization and spin order. Tuning the lattice by strain engineering has the possibility to strongly modify such magnetoelectric coupling. Here, we use ab-initio calculations to predict structural, magnetic and magnetoelectric properties of epitaxial films made of multiferroic Sr_0.5Ba_0.5MnO₃ for different chemically-ordered arrangements, and under both compressive and tensile strain. In particular, some specific regions of misfit strain are identified to yield large magnetoelectric couplings. Effects of the value of the Hubbard U parameter on these predictions will also be discussed.