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Bilayered BiFe0.95Mn0.05O3/Bi0.90La0.10FeO3 Thin Films with Low Ferroelectric Coercivity and Large Remanent Polarization

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Bilayered thin films consisting of (Bi0.90La0.10)FeO3 and Bi(Fe0.95Mn0.05)O3, i.e., Bi(Fe0.95Mn0.05)O3/(Bi0.90La0.10)FeO3, were deposited on SrRuO3 buffered SrTiO3(111) substrates by off-axis radio frequency magnetic sputtering, where (111)-oriented bilayered thin films were obtained. The bilayered Bi(Fe0.95Mn0.05)O3/(Bi0.90La0.10)FeO3 thin film possesses a lower coercive field (2Ec∼335.6 kV/cm) and a larger remanent polarization (2Pr∼155.2 C/cm2) at room temperature, and a higher relative permittivity as compared with those of single-layer (Bi0.90La0.10)FeO3 and Bi(Fe0.95Mn0.05)O3 thin films, together with an improvement of the magnetic properties (2Ms∼31.2 emu/cm3). The bottom (Bi0.90La0.10)FeO3 nanolayer promotes the growth of the Bi(Fe0.95Mn0.05)O3 layer, which are largely responsible for the multiferroic behavior observed.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, 117574 Singapore

Publication date: August 1, 2010

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