Control of supercurrent in hybrid superconducting-ferromagnetic transistors

Ivan P. Nevirkovets, Oleksandr Chernyashevskyy, Georgy V. Prokopenko, Oleg A. Mukhanov, John B. Ketterson

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We report experimental results on characteristics of SFIFS junctions and multiterminal SFIFSIS and SISFIS devices (where S, I, and F denote a superconductor (Nb), an insulator (AlOx), and a ferromagnetic material (Ni), respectively). The SFIFS (SFIS) junctions serve as injectors in the SFIFSIS (SISFIS) devices, which have transistorlike properties; for this reason, we call them superconducting-ferromagnetic transistors. We have found the F (Ni) thickness at which the SFIFS current-voltage characteristic becomes linear. For three-terminal SFIFSIS devices, we focused on studying the influence of the injection current through the SFIFS junction on the maximum Josephson current of the SIS acceptor. For four-terminal SISFIS devices, we studied dependence of the transport current through the middle Nb electrode on injection current level through the SFIS junction. In both cases, we found that the output superconducting current (either Josephson or transport) can be efficiently modulated by the quasiparticle injection from SFIFS or SFIS input junction. The experiments indicate that, after optimization of the device parameters, they can be used as input/output isolators and amplifiers for memory, digital, and RF applications.

Original languageEnglish (US)
Article number7006777
JournalIEEE Transactions on Applied Superconductivity
Issue number3
StatePublished - Jun 1 2015


  • Ferromagnetic-superconducting hybrid structures
  • Josephson effect
  • proximity effect
  • quasiparticle injection
  • superconducting transistor
  • superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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