Free-standing Ferroelectric and Magnetoelectric single crystal Membranes with super-elasticity

发布日期:2019-11-04

报告人:刘   西安交通大学电信学院教授


时间:  2019116日(周三) 上午9:30


地点: 中心校区知新楼CC1113


邀请人:颜世申 教授


报告摘要:

Ferroelectrics are usually inflexible oxides that undergo brittle deformation. We synthesized freestanding single crystalline ferroelectric BTO(BaTiO3), BFO(BiFeO3) and BTO/LSMO bi-layer membranes and with a damage-free lifting-off process. Our ferroelectric membranes can undergo a nearly 180° folding during in-situ bending test, demonstrating a super-elasticity and ultra-flexibility1. We found that the origin of the super-elasticity was from the dynamic evolution of ferroelectric nanodomains in BTO and phase change in BFO. High stresses modulate the energy landscape dramatically and allow the dipoles to rotate continuously. A continuous transition zone is formed to accommodate the variant strain and avoid high mismatch stress usually causing fracture. BTO/LSMO shows a self-assembled spring shape due to the lattice mismatch as free-standing in the air. Such spring can undergo up 50% of the length change upon a mechanic forced is loaded. The phenomenon should be possible in other ferroelectrics systems through domain engineering. The ultra-flexible epitaxial ferroelectric membranes could enable many magnetoelectric applications such as flexible sensors, memories and electronic skins.


参考文献:

1. Dong, et al., Science 366, 475-479 (2019)


报告人简介:

刘明博士,2010年博士毕业于美国东北大学电子与计算机工程系,同年获阿贡学者资助,在美国阿贡国家实验室开展博士后工作。20139月,入职西安交通大学电信学院担任教授。入选国家及陕西省人才计划。刘明博士一直从事磁电耦合功能材料与器件的研究,迄今为止,在Science, Nat. Commun., Adv. Mater等发表SCI论文120余篇,撰写英文专著1部,申请或授权发明专利16 项。担任 Physics Letter A, Scientific Reports JMIHI 编委,Sensors 客座编委,多次担任IEEE InterMagMMM 等国际学术会议分会主席。主持先进电子材料重点研发计划子课题、教育部装发联合基金、基金委面上项目等10余项基金。


                  

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