Analysis of ferroelectric polarization switching in (NH4)0.39K0.61NO3 films using nucleation limited switching model
Analysis of ferroelectric polarization switching in (NH4)0.39K0.61NO3 films using nucleation limited switching model
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使用成核限制切换模型分析 (NH4)0.39K0.61NO3 薄膜中的铁电极化极化切换
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发表时间：
2010
期刊：
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通讯作者：
R. Nath
中科院分区：
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作者：
N. Dabra;J. Hundal;A. Nautiyal;K. C. Sekhar;R. Nath
用成核限制开关(NLS)模型分析了喷射沉积铁电(NH4)0.39K0.61NO_3(NKN)薄膜的极化转换过程。实验测得的微观偏振转换曲线符合NLS模型，特征转换时间服从洛伦兹分布函数。在脉冲幅度为15V时，局域场的变化最小，这使得偏振反转的可能性更大。测得样品的自发极化强度为6.58 μC/cm~2，矫顽场为4.10kV/cm。开关回路和P-E回路的P_s值吻合较好。NKN薄膜的场发射扫描电子显微镜和原子力显微镜图像揭示了NKN纳米颗粒的形成。采用成核限制开关(NLS)模型，考虑电畴生长限制过程，分析了喷射沉积铁电(NH4)0.39K0.61NO3(NKN)薄膜的极化转换过程。实验测得的微观偏振转换曲线符合NLS模型，特征转换时间服从洛伦兹分布函数。在脉冲幅度为15V时，局域场的变化最小，这使得偏振反转的可能性更大。测得样品的自发极化强度为6.58 μC/cm~2，矫顽场为4.10kV/cm。开关回路和P-E回路的P_s值吻合较好。场发射扫描电子显微镜和原子力显微镜图像揭示了NKN纳米颗粒的形成。
The polarization switching transients of spray deposited ferroelectric (NH4)0.39K0.61NO3 (NKN) films has been analyzed with nucleation limited switching (NLS) model by considering domain growth limited process. The experimentally measured microscopic polarization switching curves fitted well with NLS model and the characteristic switching times obeyed the Lorentzian distribution function. The local field variation was found to be minimum at pulse amplitude 15 V, which makes the polarization reversal more probable. The value of spontaneous polarization, Ps and coercive field, Ec was found to be 6.58 μC/cm2 and 4.10 kV/cm, respectively. The value of Ps from the switching and P-E loop is in good agreement with each other. The field emission scanning electron microscopy and atomic force microscopy images of the NKN film reveal the formation of nanoparticles of NKN.The polarization switching transients of spray deposited ferroelectric (NH4)0.39K0.61NO3 (NKN) films has been analyzed with nucleation limited switching (NLS) model by considering domain growth limited process. The experimentally measured microscopic polarization switching curves fitted well with NLS model and the characteristic switching times obeyed the Lorentzian distribution function. The local field variation was found to be minimum at pulse amplitude 15 V, which makes the polarization reversal more probable. The value of spontaneous polarization, Ps and coercive field, Ec was found to be 6.58 μC/cm2 and 4.10 kV/cm, respectively. The value of Ps from the switching and P-E loop is in good agreement with each other. The field emission scanning electron microscopy and atomic force microscopy images of the NKN film reveal the formation of nanoparticles of NKN.