High sensitivity cantilevers for measuring persistent currents in normal metal rings

Details High sensitivity cantilevers for measuring persistent currents in normal metal rings High sensitivity cantilevers for measuring persistent currents in normal metal rings

2007-10-28

arxiv.org/abs/0710.5259v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1116/1.2958247

We 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 SQUID-based and microwave resonator-based detectors used in the past. In addition, cantilever-based detectors may allow for measurements in a cleaner electromagnetic environment. We have fabricated ultra sensitive cantilevers with integrated rings and measured their mechanical properties. We 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.

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