Conduction mechanisms and enhanced multiferroic properties of 2-2 type Bi0.89Sm0.11FeO3-NiFe2O4 composition thin films
Conduction mechanisms and enhanced multiferroic properties of 2-2 type Bi0.89Sm0.11FeO3-NiFe2O4 composition thin films
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2-2型Bi0.89Sm0.11FeO3-NiFe2O4复合薄膜的导电机制和增强的多铁性能
DOI：
10.1016/j.ceramint.2014.09.110
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发表时间：
2015
影响因子：
5.2
通讯作者：
Xia Ao
中科院分区：
文献类型：
--
作者：
Liu Wenlong;Tan Guoqiang;Xue Xu;Dong Guohua;Ren Huijun;Xia Ao
采用溶胶-凝胶法在FTO/玻璃（SnO 2：F）衬底上制备了纯BiFeO 3（BFO）、BiFeO 3-NiFe 2 O 4（BFO-NFO）和Sm掺杂Bi0.89Sm0.11FeO3-NiFe 2 O 4（BSFO-NFO）薄膜。研究了NFO层和Sm掺杂对薄膜晶体结构、漏电流、铁电和铁磁性能的影响。Rietveld精修的X射线衍射数据表明，BFO-NFO和BSFO-NFO薄膜中的BFO相为三方晶系，具有不同的空间群R3 c：和R3 m：R。BFO薄膜的漏电流在整个电场范围内均表现为欧姆发射，而BFO-NFO和BSFO-NFO薄膜在高电场下的漏电流主要为Fowler-Nordheim隧穿发射。在BSFO-NFO膜中已经观察到改善的铁电和铁磁性质，例如，最大反射极化强度为66.18 μC/cm 2，最大饱和磁化强度为31.86emu/cm 3。
Pure BiFeO3(BFO), BiFeO3–NiFe2O4(BFO–NFO) and Sm-doped Bi0.89Sm0.11FeO3–NiFe2O4(BSFO–NFO) thin films were prepared on FTO/glass (SnO2:F) substrates via a sol–gel method. The effects of NFO layer and Sm-doping on the crystalline structure, leakage current, ferroelectric and ferromagnetic properties of all the thin films were investigated. Rietveld refinement of X-ray diffraction data indicated that BFO phase in BFO–NFO and BSFO–NFO films is trigonal with different space group ofR3c:HandR3m:R. The leakage current of BFO film shows Ohmic emission at the entire electric field, whereas the dominant mechanism is changed to Fowler–Nordheim tunneling emission at the high electric field in the BFO–NFO and BSFO–NFO films. The improved ferroelectric and ferromagnetic properties have been observed in the BSFO–NFO film, e.g., large remanent polarization is 66.18 μC/cm2and large saturation magnetization is 31.86 emu/cm3.