Ferroelectricity in Pulsed Laser Deposited Ba(Fe1/2 Nb1/2 )O3 Thin Films
ZHANG Wei, WU Shu-Ya** , LI Lei, CHEN Xiang-Ming
Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027
Abstract ：Complex perovskite Ba(Fe1/2 Nb1/2 )O3 thin films are grown on Pt/TiO2 /SiO2 /Si substrates by pulsed laser deposition. Non-linear polarization–electric-field (P –E ) loops are observed at low temperatures under different electric fields and frequencies. The broad peak in the corresponding current density–electric field (J –E ) loop confirms the existence of domain switching. The remnant polarization decreases slightly when the temperature decreases from 153 to 123 K, which differentiates Ba(Fe1/2 Nb1/2 )O3 from normal ferroelectrics. The Raman spectra of Ba(Fe1/2 Nb1/2 )O3 thin films show two-mode-like behavior in the high-wavenumber region, which can be caused by the local chemically heterogeneous zones of NbO6 and FeO6 . The weak ferroelectricity observed in the Ba(Fe1/2 Nb1/2 )O3 thin films might originate from the composition fluctuation and subsequent symmetry breaking in the material. The present results might provide a new aspect to the understanding of the intrinsic dielectric nature in Ba(Fe1/2 Nb1/2 )O3 .
收稿日期: 2013-01-24
出版日期: 2013-05-31
:
77.80.-e
(Ferroelectricity and antiferroelectricity)
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2013, Vol. 30 
