Local Vortex Generation and Detection by Integrated DC Superconducting Quantum Interference Devices

概要

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A test circuit for the local generation and detection of single vortices has been fabricated, based on a multilayer structure with low-pinning e-beam evaporated Nb and high-pinning reactively sputtered NbN films. The generation of vortices is performed by a current through a control line perpendicular to a low-pinning channel. For the detection and determination of the position of generated vortices, several dc superconducting quantum interference devices (SQUID) were located around the low-pinning channel and the control line. The presence of single vortices in the channel led to a shift in the dc SQUID flux-to-voltage transfer function. By computer simulations of the flux that a single vortex generates at the position of the SQUIDs, the number and location of generated vortices could be determined. The spatial resolution of this procedure was determined to be about ±1 μm normal to and ±2 μm along the channel.
社団法人応用物理学会の論文
1995-01-15