Continuously tuneable critical current in superconductor-ferromagnet multilayers

Peter Curran, Jangyong Kim, Nathan Satchell, James Witt, Gavin Burnell, Machiel Geert Flokstra, Steve Lee, Simon Bending

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We demonstrate that the critical current of superconducting Nb/Ni multilayers can be continuously tuned by up to a factor of three during magnetization reversal of the Ni films under an applied in-plane magnetic field. Our observations are in reasonably good agreement with a model of vortex pinning by Bloch domain walls that proliferate in the samples during magnetization reversal, whereby each vortex
interacts with at most one wall in any of the Ni layers. Our model suggests ways in which the controllable pinning effect could be significantly enhanced, with important potential applications in tuneable superconducting devices.
Original languageEnglish
Article number262601
Number of pages5
JournalApplied Physics Letters
Issue number26
Publication statusPublished - 27 Jun 2017


  • Superconductivity
  • Ferromagnetism
  • Multilayers
  • Critical Current


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