Hybrid superconductor–ferromagnet transistor-like device

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We demonstrate theoretically and experimentally that a ferromagnetic layer as thin as a few nanometres, which is almost transparent for non-superconducting charge transport, can be used as a cut-off filter to block transport of charge-carrier superconducting correlations. This property may be exploited in some applications, as is exemplified by the case of double-barrier S1IS2FIS3 multi-terminal devices (with S, I, and F denoting a superconductor, an insulator, and a ferromagnetic metal, respectively), whose principle of operation is based on a nonequilibrium superconducting state driven by tunnel injection of quasiparticles. Using the F layer makes the device asymmetric and considerably improves input–output isolation in comparison with the formerly investigated symmetric S1IS2IS3 devices.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/24/2/024009

Publication date: February 1, 2011

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