Magnetic Interactions in Mesoscopic Transport Studied by Millikelvin Scanning Probe Microscopy

米利开尔文扫描探针显微镜研究介观输运中的磁相互作用

• 批准号: 9623847
• 负责人: Geoffrey Nunes
• 金额: $ 33.36万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623847&HistoricalAwards=false
• 关键词: Magnetic; Interactions; Mesoscopic; Transport; Studied

w:\awards\awards96\*.doc 9623847 Nunes Scanning probe microscopy techniques will be applied to the study of magnetic interactions in quantum transport at milliKelvin temperatures. Force microscope tips with deposited magnetic impurities will be used to place defects of a known type at known positions in a mesoscopic sample. The effect of spin scattering from these artificially introduced defects will be studied via conductance fluctuations and Aharonov-Bohm oscillations in narrow wires and rings. These experiments will provide insight into inelastic scattering processes in small devices, and offer sensitive tests of universal conductance fluctuation theory. The ability to probe and manipulate the defects in nanoscale wires and devices will ultimately allow the investigation of disorder in quantum transport at the single defect level. %%% This research program will apply techniques from the rapidly growing field of scanning probe microscopy to the study and manipulation of defects in nanoscale electronic devices. In the past, electrical measurements have only been sensitive to the average properties of a device, rather than to the individual defects out of which the average behavior is built up. The ability of scanned probe microscopes to provide spatially resolved, local information will allow us to look beneath the general properties to the underlying behavior on the atomic scale. This information will provide new physical insights unobtainable by any other means---insights which will be required for predicting and understanding the nano-electronics of the future in which the atomic-scale disorder will inevitably influence the behavior of nominally "identical" devices. ***

w:\awards\awards96\*.doc 9623847 Nunes 扫描探针显微镜技术将应用于毫开尔文温度下量子传输中磁相互作用的研究。 带有沉积磁性杂质的力显微镜尖端将用于将已知类型的缺陷放置在介观样品中的已知位置。将通过窄线和环中的电导波动和阿哈罗诺夫-玻姆振荡来研究这些人为引入的缺陷造成的自旋散射的影响。 这些实验将深入了解小型设备中的非弹性散射过程，并为通用电导涨落理论提供灵敏的测试。 探测和操纵纳米级导线和器件中的缺陷的能力最终将允许在单一缺陷水平上研究量子传输的无序。 %%% 该研究计划将应用快速发展的扫描探针显微镜领域的技术来研究和操纵纳米级电子设备中的缺陷。 过去，电气测量仅对设备的平均特性敏感，而不是对构成平均行为的单个缺陷敏感。 扫描探针显微镜提供空间分辨的局部信息的能力将使我们能够在原子尺度上观察一般特性的潜在行为。 这些信息将提供任何其他方式无法获得的新物理见解——预测和理解未来纳米电子学所需的见解，其中原子级无序将不可避免地影响名义上“相同”设备的行为。 ***