The Multiferroic Properties of Bi x FeO3 and Bi1−y Li y FeO3

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• 作者：Zhenyu Xu ; Chen Chen ; Ji Wang ; Jun Du…
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：29
• 期：7
• 页码：1821-1825
• 全文大小：953 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947
• 卷排序：29

文摘

High-quality BiFeO₃ films have been of great interest for magnetoelectric applications However the fabrication of BiFeO₃ films with large remnant polarization and low leakage current is still rather difficult. In this work, BiFeO₃-based composite films with different Bi content (Bi_xFeO₃, 0.7 ≤ x ≤ 1.3) were prepared by pulsed laser position on (001) SrTiO₃ substrates with LaNiO₃ as buffer layer. The dependence of their structure, ferroelectric properties, and exchange bias with NiFe layer on Bi content has been systematically investigated X-ray diffraction patterns show that all films have high (001) orientation, while Bi₂O₃ impurity can be observed in Bi_xFeO₃ with x ≥ 1.1. Clear ferroelectric hysteresis loops can be observed with x > 0.9. The ferroelectric properties have been further improved by Li doping with concentration of 0.03 to suppress the leakage current due to its p-type doping which can compensate the intrinsic n-type conduction. Exchange bias has been observed in all the films with a 3.6-nm-thick NiFe layer The exchange bias field decreases with increasing Bi concentration, but increases by Li doping with concentrations of 0.03 and 0.05.KeywordsMultiferroicBiFeO₃Exchange bias