Depolarization as Driving Force in Antiferroelectric Hafnia and Ferroelectric Wake-Up,ACS Applied Electronic Materials

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Depolarization as Driving Force in Antiferroelectric Hafnia and Ferroelectric Wake-Up
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsaelm.0c00184
Patrick D. Lomenzo ₁ , Claudia Richter ₁ , Thomas Mikolajick _{1,

2} , Uwe Schroeder ₁

Affiliation

Antiferroelectricity and wake-up observed in thin hafnium-oxide-based ferroelectrics are examined from the viewpoint of a macroscopic, quantitative model incorporating depolarization effects. Depolarization fields arising from finite screening, a nonferroelectric interface, and a ferroelectric/paraelectric phase mixture are shown to directly impact the switching properties and shape of ferroelectric hysteresis. Charge injection and trapping are used to demonstrate how the progressive stressing of a ferroelectric dead layer results in improved switching with electric-field cycling. The description of ferroelectric hysteresis is applied to HfO₂-based ferroelectrics where the longstanding debate concerning wake-up cycling and antiferroelectric properties can be shown to be driven by depolarization mechanisms. The calculated hystereses combine quantitative accuracy, simplicity, and compatibility to multiple microscopic interpretations that show depolarization fields can be the driving force of a field-induced first-order phase transition underlying antiferroelectric behavior.

中文翻译：

去极化作为反铁电Hafnia和铁电唤醒中的驱动力

从包含去极化作用的宏观定量模型的观点出发，研究了在薄氧化ha基铁电体中观察到的反铁电性和唤醒。有限屏蔽，非铁电界面和铁电/顺电相混合物产生的去极化场被显示为直接影响铁电磁滞的开关特性和形状。电荷注入和俘获用于证明铁电死层的渐进应力如何导致电场循环改善的开关。铁电磁滞的描述适用于HfO ₂基铁电体，其中关于唤醒循环和反铁电特性的长期争论可以证明是由去极化机制驱动的。计算出的磁滞现象结合了定量精度，简单性和对多种微观解释的兼容性，这些微观解释表明去极化场可能是反铁电行为背后的场致一阶相变的驱动力。

更新日期：2020-06-23

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