题目：Giant Magnetoelectrically Induced Tunneling Electroresistancein Multiferroic Tunnel Junctions
报告人：Prof. Qi Li（Department of Physics and Department, Pennsylvania State University, University Park，USA）
摘要：
Electrical control of spins has been the subject of intensive research in recent yearsowing to the interest in both fundamental research and practical applications of spintronicswith low power consumptions. Multiferroic tunnel junctions, i.e. magnetic tunnel junctions with ferroelectric barriers, have been proposed to allow ferroelectric control of the tunneling spin polarization through the magnetoelectric coupling at the interfaces. In this talk, I will present the experimental results which showed a novel magnetoelectric mechanism producing a giant resistive switching effect in multiferroic tunnel junctions consisting of complex oxide La1-xSrxMnO3 electrodes and a ferroelectric BaTiO3 barrier.1 By inserting aLa0.5Ca0.5MnO3 interfacial layer in the tunnel barrier, the tunneling electroresistance can be increased from 30% to 10,000% due to the interfacial phase transition between ferromagnetic metal to antiferromagnetic insulator driven by the ferroelectric polarization reversal. We have also found that such interface phase transition can serve as a spin valve to control the on and off state of the spin polarized tunneling for magnetic tunnel junctions.
Y. W. Yin,J. D. Burton, Y.-M. Kim, A. Y. Borisevich, S. J. Pennycook, S. M. Yang, T. W. Noh, A. Gruverman, X. G. Li, E. Y. Tsymbal, and Q. Li,Nature Materials 12, 397 (2013)
简介：
Qi Li is a professor at Department of Physics and Institute of Materials Research, Pennsylvania State University. Her current research interest is primarily in the areas of multiferroic and spintronics in complex oxide and metallic systems, nanostructures of topological insulators, and unconventional superconductivity.She graduated from Peking University and was a visiting scholar at KFK, Germany. She was a postdoc at Bellcore laboratory, assistant research scientist at Center for Superconductivity research at University of Maryland before joiningPenn State as an assistance professor in 1995. She is the recipient of NSF Career award among other awards, a guest professor of USTC, and a fellow of American Physical Society.
时间：2013年7月17日（星期三）上午10：30
地点：中科院物理研究所M楼236会议室
联系人：金奎娟 研究员（Tel：82648099）
主办单位：中国科学院光物理重点实验室
