时间：2011年5月20日下午15：30―17：00

地点：九龙湖校区图书馆三楼报告厅

邀请人：翟亚

Nanomagnetism by surface manipulation

Xiaofeng Jin

Department of Physics, Fudan University, Shanghai 200433, China

Properties of matter depend sensitively on physical parameters that define them. Tailoring these parameters in a well controlled way often lead to new phenomena and new state of matter. Unfortunately our ability to tune and combinatorially manage these parameters is very limited, leaving a large universe for discovery untouched. Here we develop a novel technique with molecular beam epitaxy to tune continuously and independently the surface lattice constant as well as surface chemical composition. Applying this to Permalloy on GaAs(001), we are able to answer why Py is magnetically soft. While applying to Fe on Cu(001) we observe for the first time the abnormal elastic property in Fe which expands vertically along its [001] direction when stretched horizontally along the [100] and [010] directions - a phenomenon has long been predicted by Landau but never realized in experiment. It is further proved unambiguously that this unusual elasticity originates from the interesting magnetic properties of face-centered-cubic Fe.

金晓峰，复旦大学物理系教授，我国首批长江学者奖励计划特聘教授。1983年毕业于复旦大学物理系获学士学位，87-88年，在法国同步辐射中心（LURE）进行博士生联合培养，89年2月获复旦大学理学博士学位，之后分别在LURE和瑞典Charlmers大学作博士后。93年任复旦大学教授，94年任博士生导师。这些年来在美国UC Berkeley、瑞典Charlmers大学、德国Max-Planck 微结构研究所、香港科技大学、美国犹他大学、日本东北大学、美国橡树岭国家实验室等单位任客座研究员/教授。至今在国际重要学术期刊发表论文七十多篇，在APS,MRS,AVS,ICM等国际重要学术会议作特邀报告二十多次。在多个国际学术机构任职，如IUPAP Commission on Magnetism 委员，“Journal of Physics: Condensed Matter”编委，“Journal of Magnetism and Magnetic Materials”编委等。曾获“国家杰出青年科学基金”，美国真空学会颁发的<真空科学与技术杂志>“杰出工艺论文奖”，香港求是科技基金会“杰出青年学者奖”，“长江学者奖励计划特聘教授”，中国物理学会胡刚复物理学奖。“Fellow of UK Institute of Physics”。在表面与超薄膜磁性研究方面取得优异的成绩。