论文标题
扫描探针显微镜和光谱的自主实验：选择在何处探索铁电的极化动力学
Autonomous Experiments in Scanning Probe Microscopy and Spectroscopy: Choosing Where to Explore Polarization Dynamics in Ferroelectrics
论文作者
论文摘要
铁电材料中的极化动力学通过在压电响应力光谱中的自动实验探索。开发了一个用于成像的贝叶斯优化框架，并使用先前获取的数据探索了各种采集和探路功能的性能。然后，将优化的算法部署在操作扫描探针显微镜（SPM）上，以在PBTIO3的薄膜中查找大型机电响应的区域，其中指标显示采样效率的增长〜3倍。这种方法打开了在SPM中执行更复杂光谱的途径，因为时间限制和样品稳定性，尖端磨损和/或随机样品损伤，该途径在特定的先验未知的空间位置处发生。讨论了框架的潜在改进，以进一步纳入更多先前的信息并提高效率。
Polarization dynamics in ferroelectric materials are explored via the automated experiment in Piezoresponse Force Spectroscopy. A Bayesian Optimization framework for imaging is developed and its performance for a variety of acquisition and pathfinding functions is explored using previously acquired data. The optimized algorithm is then deployed on an operational scanning probe microscope (SPM) for finding areas of large electromechanical response in a thin film of PbTiO3, with metrics showing gains of ~3x in the sampling efficiency. This approach opens the pathway to perform more complex spectroscopies in SPM that were previously not possible due to time constraints and sample stability, tip wear, and/or stochastic sample damage that occurs at specific, a priori unknown spatial positions. Potential improvements to the framework to enable the incorporation of more prior information and improve efficiency further are discussed.
