物理系学术报告       Physics Department Colloquium

 

101416:00-17:0012-201

 

 

 

Magnetic Nanodots induced Novel Magnetic Phenomena

Jian Shen

Department of Physics, Fudan University, Shanghai 200433, China 

 

摘要

Study of Magnetic nanodots is at central in the field of nanomagnetism. Besides the interesting properties caused by dimensionality effect, magnetic nanodots can induce many novel phenomena when forming heterostructures with other materials. In this work, I will use several examples to demonstrate their effect. These examples include collective ferromagnetism of nanodot arrays on 2-dimensional electron gas, colossal Coulomb blockade magnetoresistance in tri-layers, and dramatic enhancement of metal-insulator transition temperature in manganites. All these fascinating phenomena originate directly from the presence of magnetic nanodots. Their underlying mechanisms, while somewhat understood, need further theoretical studies.        

 

References

1.       T.Z. Ward, Z. Gai, X.Y. Xu, H.W.Guo, L.F. Yin, J. Shen, Phys. Rev. Lett. 106, 157207 (2011).

2.       Dali Sun, Lifeng Yin, Chengjun Sun, Hangwen Guo, Zheng Gai, X.-G. Zhang, T. Z. Ward, Zhaohua Cheng, and Jian Shen, Phys. Rev. Lett. 104, 236602 (2010).

3.       Lifeng Yin, Di Xiao, Zheng Gai, Thomas Z. Ward, Noppi Widjaja, G. Malcolm Stocks, Zhao-hua Cheng, E. Ward Plummer, Zhenyu Zhang, and Jian Shen, Phys. Rev. Lett. 104, 167202 (2010).

 

沈健教授简介:

 

沈健,1968年生于北京。现为2009年度第一批国家“千人”引人才、“复旦-浩清”特聘教授,兼任中科院微子所研究、中科院米物理海外团队核心成、美国橡国家试验室材料部低物理研究组组长、田西大学物理系教授。曾任美国真空学会磁学部主席、美国真空学会田那西分会主席、浙江大学光彪教授,并国家基金委杰出青年基金(海外)。取得的重要学成就包括:首次发现了在二体系中的氏体相及相关机理,系地研究了FeCoNi 薄膜形貌磁性的影响;首次将激光分子束外延方法引入磁性金属晶的生,成功的制了高量的磁性金属(FeCoNi)的晶薄膜和多膜;利用晶基底台取向性生,成功制规则排列的的一维链,并首次在实验明了一磁性体系的超磁表;首次利用掺杂磁性线米点,有效的控制了高分子聚合物在发时和三重的形成比例,从而在根本上提高了相光效率;合激光分子束外延和米微加工,将凝聚物理两个最重要但互不交叉的域有机合在一起,在国上最先开出一个全新的研究域。

 

在国重大学刊物上表文章90,包括3篇特邀述性文章。在国大会上做邀请报70余次,并多次组织包括APSAVSMRSMMMIntermag等大型国

 

研究方向: 纳米磁性、自旋电子学、低维物理、复杂体系强关联效应、高分子材料发光效应。