STO基BFO:Mn复合薄膜的结构与电学性能
The Structure and Electrical Properties of STO-Based BFO:Mn Composite Films
DOI: 10.12677/MP.2019.93019, PDF,    科研立项经费支持
作者: 魏 一：保定一中，河北 保定；高 洁, 董 磊, 宋建民*：河北农业大学，河北 保定
关键词: 钛酸锶；铁酸铋；复合薄膜；偏轴磁控共建溅射；异质结；Strontium Titanate； Bismuth Ferrate； Composite Film； Off-Axis Magnetron Sputtering； Heterojunction
摘要: 本文以单晶(001) SrTiO3 (STO)基片为衬底，采用偏轴磁控共建溅射法构架了Pt/BFO:Mn/LSCO/STO异质结。利用X射线衍射仪(XRD)对La0.5Sr0.5CoO3 (LSCO)和BFO:Mn复合薄膜的微观结构进行了表征，结果表明底电极LSCO和BFO:Mn薄膜均为(00l)外延生长，而BFO:Mn的复合薄膜的XRD衍射峰值强度变小。其次，通过LCR表和Keithley表对Pt/BFO:Mn/LSCO/STO(001)异质结进行了电学性能测试，结果表明BFO薄膜掺杂Mn极大的改善了电学性能，相较BFO薄膜而言，电流密度减小了三个数量级，导电机制由空间电荷限制电流(SCLC)导电机制转变为欧姆导电机制。
Abstract: In this paper, a single-crystal (001) SrTiO3 (STO) substrate is used as the bottom, and a Pt/BFO:Mn/LSCO/STO heterojunction is constructed by off-axis magnetron co-sputtering. We study the microstructures of La0.5Sr0.5CoO3 (LSCO) and BFO:Mn composite films in X-ray diffractometer (XRD). The results revealed that not only the bottom electrode LSCO but also BFO:Mn films (00l) epitaxially grown, and the strength of the composite film of BFO:Mn becomes smaller. Then, we research the electrical properties of the Pt/BFO:Mn/LSCO/STO(00l) heterojunction in LCR and Keithley. The results show that the Mn doping of the BFO film greatly improves the electrical performance compared to the BFO film. In other words, the current density is reduced by three orders of magnitude, and the conduction mechanism is changed from the space charge-restricted current (SCLC) conduction mechanism to the ohmic conduction mechanism.
文章引用：魏一, 高洁, 董磊, 宋建民. STO基BFO:Mn复合薄膜的结构与电学性能[J]. 现代物理, 2019, 9(3): 176-182. https://doi.org/10.12677/MP.2019.93019

参考文献

[1] Wang, J., Neaton, J.B., Zheng, H., Nagarajan, V., Ogale, S.B., Liu, B., Viehland, D., Vaithyanathan, V., Cx Schlom, D., Waghmare, U.V., Spaldin, N.A., Rabe, K.M., Wutting, M. and Ramesh, R. (2003) Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures. Science, 299, 1719-1722.
[Google Scholar] [CrossRef] [PubMed]
[2] Cheong, S.W. and Mostovoy, M. (2007) Multiferroics: A Magnetic Twist for Ferroelectricity. Nature Materials, 6, 13-20.
[Google Scholar] [CrossRef] [PubMed]
[3] Ramesh, R. and Spaldin, N.A. (2007) Multiferroics: Progress and Prospects in Thin Films. Nature Material, 6, 21-29.
[Google Scholar] [CrossRef] [PubMed]
[4] Scott, J.F. (2007) Multiferroic Memories. Nature Materials, 6, 256-257.
[Google Scholar] [CrossRef] [PubMed]
[5] Dho, J., Qi, X., Kim, H., et al. (2010) Large Electric Polarization and Exchange Bias in Multiferroic BiFeO3. Advanced Materials, 18, 1445-1448.
[Google Scholar] [CrossRef] 
[6] Naganuma, H., Miura, J. and Okamura, S. (2008) Ferroelectric, Electrical and Magnetic Properties of Cr, Mn, Co, Ni, Cu Added Polycrystalline BiFeO3 Films. Applied Physics Letters, 93, Article ID: 052901.
[Google Scholar] [CrossRef] 
[7] Singh, S.K., Ishiwara, H. and Maruyama, K. (2006) Room Temperature Ferroelectric Properties of Mn-Substituted BiFeO3 Thin Films Deposited on Pt Electrodes Using Chemical Solution Deposition. Applied Physics Letters, 88, Article ID: 262908.
[Google Scholar] [CrossRef] 
[8] Singh, S.K., Menou, N., Funakubo, H., et al. (2007) (111)-Textured Mn-Substituted BiFeO3 Thin Films on SrRuO3/Pt/Ti/SiO2/Si Structures. Applied Physics Letters, 90, Article ID: 242914.
[Google Scholar] [CrossRef] 
[9] 李晓娟, 李全禄, 谢妙霞, 等. 国内外压电陶瓷的新进展及新应用[J]. 硅酸盐通报, 2006, 25(4): 101-107.
[10] Feldman, C. (1955) Formation of Thin Films of BaTiO3 by Evaporation. Review of Scientific Instruments, 26, 463.
[Google Scholar] [CrossRef] 
[11] Li, W.L., Zhang, T.D., Xu, D., et al. (2015) LaNiO3 Seed Layer Induced Enhancement of Piezoelectric Properties in (100)-Oriented (1−x)BZT-xBCT Thin Films. Journal of the European Ceramic Society, 35, 2041-2049.
[Google Scholar] [CrossRef] 
[12] Shannigrahi, S. and Yao, K. (2005) Effects of WO3 Dopant on the Structure and Electrical Properties of Pb0.97La0.03(Zr0.52Ti0.48)O3 Thin Films. Applied Physics Letters, 86, Article ID: 092901.
[Google Scholar] [CrossRef] 
[13] Pintilie, L., Alexe, M., Pignolet, A., et al. (1998) Bi4Ti3O12 Ferroelectric Thin Film Ultraviolet Detectors. Applied Physics Letters, 73, 342-344.
[Google Scholar] [CrossRef] 
[14] Yu, B.F., Li, M.Y., Wang, J., et al. (2008) Enhanced Electrical Properties in Multiferroic BiFeO3 Ceramicsco-Doped by La3+ and Vs+. Journal of Physics D: Applied Physics, 41, Article ID: 185401.
[Google Scholar] [CrossRef] 
[15] Yi, H.T., Choi, T., Choi, S.G., et al. (2011) Mechanism of the Switchable Photovoltaic Effect in Ferroelectric BiFeO3. Advanced Materials, 23, 3403-3407.
[Google Scholar] [CrossRef] [PubMed]
[16] Zhao, T., Scholl, A., Zavaliche, F., et al. (2006) Electrical Control of Antiferro-magnetic Domains in Multiferroic BiFeO3 Films at Room Temperature. Nature Materials, 5, 823-829.
[Google Scholar] [CrossRef] [PubMed]