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【预告】北京航天航空大学许怀哲教授应邀来我校做学术报告

  2015-06-02 10:16:06  

报告题目:The microstructure and magnetic coupling mechanism in Mn-doped ZnO nanocrystals
报告地点:实验楼四层报告厅
报告时间:6月12日15: 00

报告人简介:1995年毕业于兰州大学物理系获博士学位,1999年1月--2006年5月间,先后任职Nottingham University物理与天文系研究员;Tsukuba University物理工学系助教授;Oklahoma University电机系Research Associate;Tohoku University电气通讯研究所产学官连携研究员。2006年6月至今任北京航空航天大学物理科学与核能工程学院教授,凝聚态物理学科博士生导师。北航“211”建设凝聚态物理学科带头人,北京市重点学科及国防科工委重点学科自旋电子学方向带头人,工信部 “理论物理”支撑学科责任教授。目前从事磁性半导体材料,半导体中的自旋相关现象与效应,以及新型低维材料石墨烯,石墨炔等能带调控和输运特性,氧化物光催化材料等方面的研究,发表SCI收录论文100余篇,曾获省级科技进步一等奖和二等奖各一项。

 

Abstract: Zn1-xMn¬xO nanocrystals were synthesized by a wet chemical method and post processed with dodecanethiol, octylamine and H2/Ar. The coordination environment and magnetic properties were characterized by XRD, XPS, Raman, PL, XAFS, XPS and PPMS. It is found that the solubility of substitutional Mn in ZnO lattice is very low (<0.4 %). When x ≤ 0.001, Mn ions are initially dissolved into the substitutional sites in ZnO lattice forming Mn2+O4 tetrahedral coordination, and it then enter into the interstitial sites and forming Mn3+O6 octahedral coordination when x ≥ 0.005. After being processed with dodecanethiol, octylamine and H2/Ar, the solubility of Mn increased due to orbital hybridization between Mn and S (N or H), and some interstitial Mn ions would dissolve into the ZnO lattice and substitute for Zn. The samples exhibited both ferromagnetic and antiferromagnetic behavior, the relationship between the magnetic coupling and Mn coordination environment are analyzed and discussed.

 

 

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