Properties and superlattice for multiferroics BiMnO$_{3}$ .
ORAL
Abstract
Single-phase multiferroics BiMnO$_{3 }$ceramic was synthesized via high-pressure high-temperature technique. Microstructure modification accompanied by emergence of superlattice due to electron-beam irradiation was observed wherein by means of ED and HRTEM. Magnetic evaluation manifesting a unique ferromagnetic phase transition at 103 K has corroborated our speculation that as-prepared BiMnO3 ceramic is free of polymorphism at room temperature. Furthermore, magnetization versus temperature ($M-T)$ characterization combined with \textit{in situ} variable temperature powder X-ray diffraction (XRD) and dielectric constant versus temperature (\textit{$\varepsilon $-T}) spectrum scanning confirmed that as-prepared BiMnO$_{3}$ specimen exhibits simultaneous occurrence of ferromagnetism and ferroelectricity below its ferromagnetic Curie temperature ($T_{M})_{ }$of 103 K. .
*This work was supported by NSF and Ministry of Science and Technology of China through the research projects.
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