报告题目:A new non-destructive readout by using photo-recovered surface potential contrast
报告人:金奎娟
中国科学院物理所光物理重点实验室
地点:李薰楼468会议室
时间:2015.8.24 (周一)上午9:30
Abstract:
Ferroelectric random access memory is still challenging in the feature of combination of room temperature stability, non-destructive readout and high intensity storage. As a non-contact and non-destructive information readout method, surface potential has never been paid enough attention because of the unavoidable decay of the surface potential contrast between oppositelypolarized domains. That is mainly due to the recombination of the surface movable chargesaround the domain walls. Here, by introducing a laser beam into the combination of piezoresponse force microscopy and Kelvin probe force microscopy, we demonstrate that the surface potential contrastof BiFeO3 films can be recoveredunderlight illumination.The recovering mechanism is understoodbased on the redistribution of the photo-induced charges driven by the internal electric field. Furthermore, we have created a 12-cell memory pattern based on BiFeO3 films to show the feasibility of such photo-assisted non-volatile and non-destructive readout of the ferroelectric memory.
金奎娟简介:
国家基金委杰出青年科学基金获得者。1995 年在中国科学院物理所获理学博士学位,师从杨国桢院士。其间荣获中科院院长奖学金特等奖。1995年留所工作。研究论文曾获《饶毓泰基础光学》一等奖。随后分别在美国橡树岭国家实验室和田纳西大学、瑞典LUND大学作博士后。2003年回所工作。2005年任L03课题组组长,2008年任北京凝聚态物理国家实验室(筹)主任助理,2009年任中科院光物理重点实验室主任,中国物理学会光物理专业委员会主任。2010年获得“全国优秀科技工作者”荣誉称号和奖章。2011年当选英国物理学会(IOP)Fellow,同年荣获中国物理学会谢希德物理奖,当选中国物理学会常务理事。2012年当选美国物理学会会士(APS fellow)。2013年当选亚太物理学会(AAPPS)常务理事(Council Member),并作为首席科学家承担国家重大研究计划项目。担任nature子刊Sci. Rep.,中国科学,中国物理快报等多种国际学术期刊编委。