Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel
arXiv:0809.1852 · doi:10.1063/1.3000683
Abstract
We have developed a picovoltmeter using a Nb dc Superconducting QUantum Interference Device (SQUID) for measuring the flux-flow voltage from a small number of vortices moving through a submicron weak-pinning superconducting channel. We have applied this picovoltmeter to measure the vortex response in a single channel arranged in a circle on a Corbino disk geometry. The circular channel allows the vortices to follow closed orbits without encountering any sample edges, thus eliminating the influence of entry barriers.
4 pages, 3 figures, submitted to Review of Scientific Instruments
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