Florida State University熊鹏教授将于2007年7月6日来我实验室访问，并做题为 《Semiconductor micro-Hall Magnetometry: from nanomagnetism to biosensing》的学术报告。熊鹏教授在磁性半导体，高自旋极化率自旋电子材料的物理研究，自旋注入检测与操控，微磁学在生物检测中的应用等方面开展了一些列的工作，在《Physical Review Letters》等国际顶尖刊物上发表多篇论文。

报告内容摘要：

Semiconductor micro-Hall Magnetometry: from nanomagnetism to biosensing

Peng Xiong

Department of Physics and Center for Materials Research and Technology 
Florida State University,

Semiconductor Hall magnetometry is an ultra-sensitive magnetic measurement technique with broad temperature and magnetic field operation ranges, which promises a wide variety of applications. In this talk I will review our effort in the optimization of micro-Hall magnetometers based on high-mobility semiconductor heterostructures through systematic miniaturization and detailed noise studies. Magnetic moment sensitivity better than 104 mB/Hz1/2 is demonstrated. Results of magnetic measurements on individual Fe nanoparticles as small as 5 nm with GaAs/AlGaAs devices [1] and room-temperature detection of a single superparamagnetic bead with InAs quantum wells [2] will be presented. The implementation of magnetic detection of DNA and proteins with InAs micro-Hall devices and superparamagnetic labels will be described. 

[1] Y. Li et al., APL 80, 4644 (2002), PRL 93, 246602 (2004), PRB 71, 21445 (2005).
[2] G. Mihajlovic et al.,APL 87, 112502 (2005), JAP (in press).