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Structure and Dynamics of Ferroelectric Domains in Multiferroic BiFeO3 Thin Films
Xiaoqing Pan
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109
BiFeO3 has attracted great interest owing to their room temperature multiferroic nature with potential applications in memories and spintronic devices. The understanding and control of domain structures and electrical switching behaviors are critical for the fabrication of BiFeO3 thin films desirable for devices. In this talk it will be shown that the ferroelectric domain structures of epitaxial BiFeO3 films is strongly influenced by strain and the atomic structure of the substrate surface and by boundary conditions. The roles of electrical and mechanicals boundary conditions in the formation, growth, and electrical switching of domains in BiFeO3 are studied by atomic resolution transmission electron microscopy (TEM) and by direct observations using in-situ scanning tunneling microscope (STM) holder in TEM. It will be shown that epitaxial BiFeO3 thin films with desirable domain patterns can be fabricated with controlled electrical and mechanical boundary conditions. The experimental results are compared with phase-field modeling.
潘晓晴简介
潘晓晴，1991年获德国萨尔兰大学物理学博士，现为美国密西根大学材料科学与工程系教授、密西根大学电子微束分析实验室主任。潘晓晴教授主要从事长期从事电子显微学、薄膜生长、纳米结构、表面与界面等方面的研究。近年来主要研究氧化物异质机构及其纳米材料的多铁性及其光电性能，在揭示新型纳米结构的铁电性、透明氧化物半导体特性、超导薄膜材料的结构与性能的关系等方面取得许多国际有重要影响的研究成果。迄今已在国际权威学术杂志发表论文200余篇，其中在《自然》和《自然•材料》发表5篇、《科学》发表2篇、《先进材料》发表4篇。1998年获得美国国家科学基金CAREER奖（前总统青年科研奖）、1998年获中国海外杰出青年基金等。曾任中科院海外评审专家，中科院国际创新团队首席科学家，南京大学长江讲座教授。
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