Effect of Annealing on Room Temperature Multiferroics of BiFe_1-xCo_xO₃

Abstract:

We studied the effect of annealing and Co ion doping on the structure, leakage current, ferroelectric polarization and magnetism of BiFeO₃ samples. X-ray diffraction patterns demonstrate that an appropriate Co doping concentration is favor of suppressing the secondary phase but annealing treatment is apt to the growth of both the main and the secondary phases. The current density as a function of an electric field indicates that Co doping increases the leakage current density as samples before annealing but suppresses it after annealing. Annealing treatment improves the leakage for Co-doped sample and reduces it for the undoped sample. Ferroelectric hysteresis loops reflect that Co ions doping is liable to increase the ferroelectric polarization, while the sample is annealed it will do opposite effect. However the annealing treatment do improve the ferroelectricity for pure BiFeO₃ sample. The magnetic hysteresis at room temperature shows the obvious enhancement of ferromagnetic properties with the sample after annealing.

• Periodical: Materials Science Forum (Volume 859)
• Pages: 30-35
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.859.30
• Online since: May 2016
• Authors: Yang Wang, De Xiang Fu, Wen Zhi Li, Jian Hua Wang, Wen Hao Zhang, Yong Tao Li, Sheng Li Liu, Liang Xie, Hong Guang Zhang*
• Keywords: Annealing, Doping, Ferroelectricity, Leakage, Magnetism, Mutiferroics, X-Ray Diffraction

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