High sensitivity cantilevers for measuring persistent currents in normal metal rings
High sensitivity cantilevers for measuring persistent currents in normal metal rings
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DOI：
10.1116/1.2958247
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发表时间：
2008-07-01
影响因子：
1.4
通讯作者：
Harris, J. G. E.
中科院分区：
文献类型：
--
作者：
Bleszynski-Jayich, A. C.;Shanks, W. E.;Harris, J. G. E.
作者提出了一种测量正常金属环中持续电流的新方法。通过将微米级金属环集成到敏感的微机械悬臂梁中，并将悬臂梁用作扭矩磁力计，应该可以以比过去使用的基于超导量子干涉装置和基于微波谐振器的探测器更高的灵敏度测量环的持续电流。此外，基于悬臂的探测器可以在更清洁的电磁环境中进行测量。作者制作了带有集成环的超灵敏悬臂梁，并测量了其力学性能。作者提出了对这些基于悬臂梁的探测器的持续电流灵敏度的估计，重点是悬臂梁的布朗运动和监测悬臂梁的激光干涉仪中的散粒噪声所设定的限制。(C) 2008年美国真空学会。
The authors propose a new approach to measuring persistent currents in normal metal rings. By integrating micron-scale metal rings into sensitive micromechanical cantilevers and using the cantilevers as torque magnetometers, it should be possible to measure the rings' persistent currents with greater sensitivity than the superconducting quantum interference device based and microwave resonator-based detectors used in the past. In addition, cantilever-based detectors may allow for measurements in a cleaner electromagnetic environment. The authors have fabricated ultrasensitive cantilevers with integrated rings and measured their mechanical properties. The authors present an estimate of the persistent current sensitivity of these cantilever-based detectors, focusing on the limits set by the cantilever's Brownian motion and the shot noise in the laser interferometer that monitors the cantilever. (C) 2008 American Vacuum Society.