Polarization pinning at antiphase boundaries in multiferroic YbFeO_(3)  

作　　者：Guodong Ren Pravan Omprakash Xin Li Yu Yun Arashdeep S.Thind Xiaoshan Xu Rohan Mishra 

机构地区：[1]Institute of Materials Science and Engineering,Washington University in St.Louis,St.Louis,MO 63130,USA [2]Department of Physics and Astronomy,University of Nebraska,Lincoln,NE 68588,USA [3]Department of Mechanical Engineering & Mechanics,Drexel University,Philadelphia,PA 19104-2875,USA [4]Nebraska Center for Materials and Nanoscience,University of Nebraska,Lincoln,NE 68588,USA [5]Department of Mechanical Engineering and Material Science,Washington University in St.Louis,St.Louis,MO 63130,USA

出　　处：《Chinese Physics B》2024年第11期39-45,共7页中国物理B（英文版）

基　　金：supported by the National Science Foundation(NSF)(Grant Nos.DMR-2122070,2145797,and 1454618);by the Nebraska Center for Energy Sciences Research(NCESR);supported by NSF grants#2138259,#2138286,#2138307,#2137603,and#2138296。

摘　　要：The switching characteristics of ferroelectrics and multiferroics are influenced by the interaction of topological defects with domain walls.We report on the pinning of polarization due to antiphase boundaries in thin films of the multiferroic hexagonal YbFeO_(3).We have directly resolved the atomic structure of a sharp antiphase boundary(APB)in YbFeO_(3) thin films using a combination of aberration-corrected scanning transmission electron microscopy(STEM)and total energy calculations based on density-functional theory(DFT).We find the presence of a layer of FeO_(6) octahedra at the APB that bridges the adjacent domains.STEM imaging shows a reversal in the direction of polarization on moving across the APB,which DFT calculations confirm is structural in nature as the polarization reversal reduces the distortion of the FeO_(6) octahedral layer at the APB.Such APBs in hexagonal perovskites are expected to serve as domain-wall pinning sites and hinder ferroelectric switching of the domains.

关 键 词：hexagonal ferrites FERROELECTRIC MULTIFERROIC topological defect STEM 

分 类 号：O469[理学—凝聚态物理]