Geometry Effects on Switching Currents in Superconducting Ultra Thin Films

A. Leo, A. Nigro, S. Pace, A. Guarino, N. Martucciello, G. Grimaldi, V. La Ferrara, E. Bobeico, J.C. Villégier

Research output: Contribution to conferencePaper

2 Citations (Scopus)


Vortex dynamics is strongly connected with the mechanisms responsible for the photon detection of superconducting devices. Indeed, the local suppression of superconductivity by photon absorption may trigger vortex nucleation and motion effects, which can make the superconducting state unstable. In addition, scaling down the thickness of the superconducting films and/or the width of the bridge geometry can strongly influence the transport properties of superconducting films, e.g. affecting its critical current as well as its switching current into the normal state. Understanding such instability can boost the performances of those superconducting devices based on nanowire geometries. We present an experimental study on the resistive switching in NbN and NbTiN ultra-thin films with a thickness of few nanometers. Despite both films were patterned with the same microbridge geometry, the two superconducting materials show different behaviors at very low applied magnetic fields. A comparison with other low temperature superconducting materials outlines the influence of geometry effects on the superconducting transport properties of these materials particularly useful for devices applications.
Original languageEnglish
Publication statusPublished - 9 Mar 2018
Event16th International Superconductive Electronics Conference, ISEC 2017 - Napoli, Italy
Duration: 9 Mar 2018 → …


Conference16th International Superconductive Electronics Conference, ISEC 2017
Period9/3/18 → …


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Leo, A., Nigro, A., Pace, S., Guarino, A., Martucciello, N., Grimaldi, G., La Ferrara, V., Bobeico, E., & Villégier, J. C. (2018). Geometry Effects on Switching Currents in Superconducting Ultra Thin Films. Paper presented at 16th International Superconductive Electronics Conference, ISEC 2017, Napoli, Italy.