Enhanced multiferroic properties of BiFeO3 thin films by Nd and high-valence Mo co-doping

Enhanced multiferroic properties of BiFeO3 thin films by Nd and high-valence Mo co-doping
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Nd 和高价 Mo 共掺杂增强 BiFeO3 薄膜的多铁性能

DOI:
10.1088/0022-3727/42/18/185010
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发表时间:
2009-09
期刊:
Journal of Physics D: Applied Physics
影响因子:
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采用脉冲激光沉积方法在 Pt/Ti/SiO2/Si 基底上制备了纯 BiFeO3 (BFO)、Nd 掺杂 BFO (BNF) 以及 Nd 和 Mo 共掺杂 BFO (BNFM) 多铁性薄膜。在这些薄膜中,BNFM薄膜表现出最低的介电损耗和漏电流密度、良好饱和的P-E环、优异的电荷保持能力和无疲劳行为。此外,在该薄膜中观察到铁磁性得到改善,饱和磁化强度为~15 emu cm−3。铁电和铁磁性能的显着改善初步归因于 Nd 和高价 Mo 共掺杂消除了氧空位以及薄膜中 Fe2+ 离子的增加。
Pure BiFeO3 (BFO), Nd-doped BFO (BNF) and Nd and Mo co-doped BFO (BNFM) multiferroic thin films were prepared by pulsed laser deposition on Pt/Ti/SiO2/Si substrates. Among these films, the BNFM film exhibited the lowest dielectric loss and leakage current density, a well-saturated P–E loop, excellent charge-retaining ability and fatigue-free behaviour. Furthermore, improved ferromagnetism was observed in this film with a saturation magnetization of ∼15 emu cm−3. These significant improvements in ferroelectric and ferromagnetic properties could be preliminarily attributed to the elimination of oxygen vacancies and the increase in the Fe2+ ions in the film by Nd and high-valence Mo co-doping, respectively.
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