Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO 3 films
MacManus-Driscoll, Judith L.
Nature Publishing Group UK
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Choi, E., Maity, T., Kursumovic, A., Lu, P., Bi, Z., Yu, S., Park, Y., et al. (2020). Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO 3 films. Nature Communications, 11 (1)https://doi.org/10.1038/s41467-020-16101-2
Abstract: Orthorhombic RMnO3 (R = rare-earth cation) compounds are type-II multiferroics induced by inversion-symmetry-breaking of spin order. They hold promise for magneto-electric devices. However, no spontaneous room-temperature ferroic property has been observed to date in orthorhombic RMnO3. Here, using 3D straining in nanocomposite films of (SmMnO3)0.5((Bi,Sm)2O3)0.5, we demonstrate room temperature ferroelectricity and ferromagnetism with TC,FM ~ 90 K, matching exactly with theoretical predictions for the induced strain levels. Large in-plane compressive and out-of-plane tensile strains (−3.6% and +4.9%, respectively) were induced by the stiff (Bi,Sm)2O3 nanopillars embedded. The room temperature electric polarization is comparable to other spin-driven ferroelectric RMnO3 films. Also, while bulk SmMnO3 is antiferromagnetic, ferromagnetism was induced in the composite films. The Mn-O bond angles and lengths determined from density functional theory explain the origin of the ferroelectricity, i.e. modification of the exchange coupling. Our structural tuning method gives a route to designing multiferroics.
Article, /639/301, /639/301/119, /639/301/119/996, /128, /132, /145, /147/3, /147/143, /147/137, /120, article
RCUK | Engineering and Physical Sciences Research Council (EPSRC) (EP/L011700/1 and EP/N004272/1)
External DOI: https://doi.org/10.1038/s41467-020-16101-2
This record's URL: https://www.repository.cam.ac.uk/handle/1810/321964