Anomalously abrupt switching of wurtzite-structured ferroelectrics: simultaneous non-linear nucleation and growth model
Anomalously abrupt switching of wurtzite-structured ferroelectrics: simultaneous non-linear nucleation and growth model
复制标题
纤锌矿结构铁电体的异常突变：同时非线性成核和生长模型
DOI：
10.1039/d3mh00365e
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发表时间：
2023
影响因子：
13.3
通讯作者：
Brennecka, Geoff L.
中科院分区：
文献类型：
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作者：
Yazawa, Keisuke;Hayden, John;Maria, Jon-Paul;Zhu, Wanlin;Trolier-McKinstry, Susan;Zakutayev, Andriy;Brennecka, Geoff L.
铁电极化切换是通过成核和生长发生的过程的一个常见示例，并且理解切换动力学对于诸如铁电存储器的应用至关重要。在这里，我们描述和解释的纤锌矿结构的氮化物薄膜铁电体Al0.7Sc0.3N和Al0.94B0.06N使用的一般模型，可以直接应用到其他突变，通过成核和生长进行的异常开关动力学。当在成核速率增加的同时发生大量生长和碰撞时，例如在高电场下的这些纤锌矿结构的铁电体中，突然的极化反转导致非常大的Avrami系数（例如，n = 11），启发KAI（Kolmogorov-Avrami-Ishibashi）模型的扩展。我们将此扩展模型应用到两个相关但不同的场景，（典型的）行为之间的交叉所描述的顺序成核和生长和更突然的过渡所产生的显着增长之前的峰值成核率。因此，这项工作提供了一个更完整的描述适用于任何系统的一般成核和生长动力学，同时专门解决新的纤锌矿结构的铁电体中的异常突然的极化反转行为。
Ferroelectric polarization switching is one common example of a process that occurs via nucleation and growth, and understanding switching kinetics is crucial for applications such as ferroelectric memory. Here we describe and interpret anomalous switching dynamics in the wurtzite-structured nitride thin film ferroelectrics Al0.7Sc0.3N and Al0.94B0.06N using a general model that can be directly applied to other abrupt transitions that proceed via nucleation and growth. When substantial growth and impingement occur while nucleation rate is increasing, such as in these wurtzite-structured ferroelectrics under high electric fields, abrupt polarization reversal leads to very large Avrami coefficients (e.g., n = 11), inspiring an extension of the KAI (Kolmogorov–Avrami–Ishibashi) model. We apply this extended model to two related but distinct scenarios that crossover between (typical) behavior described by sequential nucleation and growth and a more abrupt transition arising from significant growth prior to peak nucleation rate. This work therefore provides a more complete description of general nucleation and growth kinetics applicable to any system while specifically addressing the anomalously abrupt polarization reversal behavior in new wurtzite-structured ferroelectrics.