Complex Materials and Devices, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58 183, Linköping, Sweden.
Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.
Nat Commun. 2018 Oct 23;9(1):4409. doi: 10.1038/s41467-018-06717-w.
The Preisach model has been a cornerstone in the fields of ferromagnetism and ferroelectricity since its inception. It describes a real, non-ideal, ferroic material as the sum of a distribution of ideal 'hysterons'. However, the physical reality of the model in ferroelectrics has been hard to establish. Here, we experimentally determine the Preisach (hysteron) distribution for two ferroelectric systems and show how its broadening directly relates to the materials' morphology. We connect the Preisach distribution to measured microscopic switching kinetics that underlay the macroscopic dispersive switching kinetics as commonly observed for practical ferroelectrics. The presented results reveal that the in principle mathematical construct of the Preisach model has a strong physical basis and is a powerful tool to explain polarization switching at all time scales in different types of ferroelectrics. These insights lead to guidelines for further advancement of the ferroelectric materials both for conventional and multi-bit data storage applications.
普雷沙克模型自诞生以来一直是铁磁性和铁电性领域的基石。它将真实的、非理想的铁电材料描述为理想“磁滞回子”分布的总和。然而，该模型在铁电体中的物理现实一直难以确定。在这里，我们通过实验确定了两个铁电系统的普雷沙克（磁滞回子）分布，并展示了其展宽如何与材料的形态直接相关。我们将普雷沙克分布与测量的微观开关动力学联系起来，该动力学是宏观弥散开关动力学的基础，如常见于实际铁电体中观察到的那样。所提出的结果表明，普雷沙克模型的原理数学结构具有很强的物理基础，是解释不同类型铁电体中不同时间尺度上极化开关的有力工具。这些见解为进一步改进铁电材料提供了指导，无论是对于传统的还是多比特数据存储应用。
