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In Ba0.6Sr0.4TiO3 (BSTO)-based epitaxial nanocomposite films increased Pr values are demonstrated by up to a factor of 3 compared to standard BSTO films. A strongly reduced temperature coefficient of polarization retention is also obtained, i.e., 0.07% °C−1 compared to 0.24% °C−1. Piezopoling with only marginal leakage current is also achieved up to 200 °C, the highest temperature studied. The origin of the improved performance is the incorporation of Sm2O3 nanopillars in the films which acted as stiff vertical nanoscaffolds, inducing a strong tetragonal distortion in the BSTO (up to 1.033(7) in terms of the out-of-plane/in-plane lattice dimensions). The films have comparable performance to industry-standard Pb(Zr,Ti)O3 films, at the same time as being Pb-free. [ABSTRACT FROM AUTHOR]

The article discusses study on interface-coupled bismuth ferrite, BiFeO3(BFO)/bismuth magnesium oxide, BiMnO3 (BMO) superlattices with magnetic transition temperature up to 410 Kelvin. Topics discussed include ferroelectricity in perovskite oxides, verification of epitaxy as well as the phase purity of the superlattices and magnetic transitions and clear magnetization at temperatures above the critical temperature of BMO.