BiFeO3外延薄膜的自极化调控
Self-polarization Modulation of BiFeO3 Epitaxial Films
沈国阳 1梁仁宏 1朱丽雯 1王支国 1舒龙龙1
作者信息
- 1. 南昌大学 物理与材料学院,江西 南昌 330031
- 折叠
摘要
通过对衬底/底电极界面行为的研究,发现界面效应可以调控BiFeO3外延薄膜的自极化.由于底电极和薄膜均具有钙钛矿类型的结构,通过改变衬底/底电极的界面类型和阴/阳离子层排列方式,可以在BiFeO3/SrRuO3(La0.67Sr0.33MO3)/SrTiO3 异质结构中获得两种不同类型的界面.实验结果表明BFO薄膜在SrTiO3 衬底上共格生长,且两种异质结薄膜呈向上/向下的内建电场Eb和c-畴180°翻转.这些研究结果揭示了不同底电极选择导致的异质结构界面处的电荷分布与内建电场方向的差异,为调控异质结性能提供了一种可选途径.
Abstract
Through the investigation of the substrate/bottom electrode interface behavior,it is discovered that interface effects can modulate the polarization of BiFeO3 epitaxial films.As both the bottom electrode and the film possess perovskite-type structures,by altering the interface layer type and position of the substrate/bottom electrode,two different types of interfaces can be achieved in the BFO/SRO(LSMO)/STO heterostructure.XRD and RSM characterizations indicate that the BFO film grows epitaxially on the STO substrate.Combined with PFM characterization,the two heterostructure films exhibit upward/downward spontaneous polarization(Eb)and c-domain 180°flipping.These research findings reveal differences in charge distribution and the direc-tion of the built-in electric field at the interface of heterostructures caused by different choices of bottom elec-trodes,providing new strategies for modulating the performance of heterostructure devices.
关键词
外延薄膜/界面效应/自极化Key words
epitaxial thin film/interface effect/self-polarization引用本文复制引用
基金项目
国家自然科学基金(51962020)
国家自然科学基金(12174174)
出版年
2024
国家科技期刊平台
NSTL
万方数据