论文标题
铁电异质结构自发极化的电探测的局限性
Limitations to Electrical Probing of Spontaneous Polarization in Ferroelectric-Dielectric Heterostructures
论文作者
论文摘要
从材料科学的角度来看，对铁电二层堆栈中铁电化极化的准确估计值也很重要，这对于基于铁电的电子设备的开发也至关重要。本文通过使用分析推导和数值模拟来重新审视专家技术在金属 - 弗洛电 - 二电 - 基准（MFDM）结构中的理论和应用。在MFDM结构中，专家技术的结果可能与堆栈中实际切换的极化有很大不同，这反过来又与基础铁电的残余极化不同。因此，讨论了防止专家测量提供对MFDM堆栈中极化切换的良好估计的主要障碍。对所涉及的物理量的检查，并不总是在实验中访问，提供了有关专家技术中误差的主要来源的有用见解，并阐明了去极化场与电荷注入和捕获MFDM堆栈之间的微妙相互作用，并用薄的介电层进行捕获。
An accurate estimate of the ferroelectric polarization in ferroelectric-dielectric stacks is important from a materials science perspective, and it is also crucial for the development of ferroelectric based electron devices. This paper revisits the theory and application of the PUND technique in Metal-Ferroelectric-Dielectric-Metal (MFDM) structures by using analytical derivations and numerical simulations. In an MFDM structure the results of the PUND technique may largely differ from the polarization actually switched in the stack, which in turn is different from the remnant polarization of the underlying ferroelectric. The main hindrances that prevent PUND measurements from providing a good estimate of the polarization switching in MFDM stacks are thus discussed. The inspection of the involved physical quantities, not always accessible in experiments, provides a useful insight about the main sources of the errors in the PUND technique, and clarifies the delicate interplay between the depolarization field and the charge injection and trapping in MFDM stacks with a thin dielectric layer.
