Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links

Details Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links

2000-03-23

arxiv.org/abs/cond-mat/0003383v3

Europhys. Lett. 51, 434 (2000).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 8 figures, Europhys. Lett., to be published, corrected two references

Scientific paper

10.1209/epl/i2000-00513-x

We consider a mesoscopic normal metal, where the spin degeneracy is lifted by a ferromagnetic exchange field or Zeeman splitting, coupled to two superconducting reservoirs. As a function of the exchange field or the distance between the reservoirs, the supercurrent through this device oscillates with an exponentially decreasing envelope. This phenomenon is similar to the tuning of a supercurrent by a non-equilibrium quasiparticle distribution between two voltage-biased reservoirs. We propose a device combining the exchange field and non-equilibrium effects, which allows us to observe a range of novel phenomena. For instance, part of the field-suppressed supercurrent can be recovered by a voltage between the additional probes.

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