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Magnetic vortices in superconducting photon detectors


Engel, A; Bartolf, H; Schilling, A; Semenov, A; Hübers, H-W; Il'in, K; Siegel, M (2009). Magnetic vortices in superconducting photon detectors. Journal of Modern Optics, 56(2-3):352-357.

Abstract

We have measured critical-current densities in micro- and nanometer wide thin-film NbN bridges. These bridges show significant changes in the temperature dependence of the critical-current density depending on the strip width. Taking into account the boundary conditions at the strip edges we can qualitatively describe our data applying a geometric edge-barrier model. We conclude that sub-µm wide bridges remain free of single vortices in ambient magnetic fields and at currents up to the depairing critical-current density. This also means that NbN meanders of superconducting single photon detectors should be free of single vortices under normal operating conditions.

Abstract

We have measured critical-current densities in micro- and nanometer wide thin-film NbN bridges. These bridges show significant changes in the temperature dependence of the critical-current density depending on the strip width. Taking into account the boundary conditions at the strip edges we can qualitatively describe our data applying a geometric edge-barrier model. We conclude that sub-µm wide bridges remain free of single vortices in ambient magnetic fields and at currents up to the depairing critical-current density. This also means that NbN meanders of superconducting single photon detectors should be free of single vortices under normal operating conditions.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:critical-current density; geometric edge-barrier; magnetic vortices; superconducting photon detector
Language:English
Date:January 2009
Deposited On:30 Mar 2009 07:24
Last Modified:05 Apr 2016 12:50
Publisher:Taylor & Francis
ISSN:0950-0340
Publisher DOI:https://doi.org/10.1080/09500340802272340

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