Composition Dependence in BiFeO3 Film Capacitor with Suppressed Leakage Current by Nd and Mn Cosubstitution and Their Ferroelectric Properties
Composition Dependence in BiFeO3 Film Capacitor with Suppressed Leakage Current by Nd and Mn Cosubstitution and Their Ferroelectric Properties
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DOI：
10.1143/jjap.47.7586
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发表时间：
2008-09
影响因子：
1.5
通讯作者：
T. Kawae;H. Tsuda;H. Naganuma;S. Yamada;M. Kumeda;S. Okamura;A. Morimoto
中科院分区：
文献类型：
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作者：
T. Kawae;H. Tsuda;H. Naganuma;S. Yamada;M. Kumeda;S. Okamura;A. Morimoto
(Nd采用脉冲激光沉积法在Pt/SrTiO 3（100）衬底上制备了不同Nd和Mn含量的BiFeO 3（BFO）薄膜。X射线衍射和原子力显微镜的图像表明，抑制杂质相和一个光滑的表面形貌实现了Nd替代的BFO薄膜。此外，通过与Nd取代相结合，少量的Mn取代在BFO膜中对于将漏电流密度与BFO膜电容器的漏电流密度相比降低三个数量级是有效的。在0.1 ~ 2kHz范围内，极化-电场（P-E）曲线对测量频率有很强的依赖性，室温下在20 kHz处观察到饱和的P-E磁滞回线。在1.9 MV/cm的最大电场下，反极化和矫顽场分别约为70 µC/cm 2和0.32 MV/cm。
(Nd,Mn)-cosubstituted BiFeO3 (BFO) films with various Nd and Mn compositions were fabricated on a Pt/SrTiO3(100) substrate by pulsed laser deposition. X-ray diffraction patterns and atomic force microscopy images indicated that the suppression of impurity phases and a smooth surface morphology were realized by Nd substitution in the BFO films. Furthermore, by combining with Nd substitution, a small amount of Mn substitution in BFO films is effective for reducing the leakage current density by three orders of magnitude compared with that of a BFO film capacitor. The polarization vs electric field (P–E) curves showed a strong dependence of measurement frequency in the range of 0.1–2 kHz, and well-saturated P–E hysteresis loops were observed at 20 kHz at room temperature. The remanent polarization and coercive field at a maximum electric field of 1.9 MV/cm were approximately 70 µC/cm2 and 0.32 MV/cm, respectively.