Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0003383,
title = {Non-equilibrium supercurrent through mesoscopic ferromagnetic weak links},
author = {Tero T. Heikkila and Frank K. Wilhelm and Gerd Schoen},
journal= {arXiv preprint arXiv:cond-mat/0003383},
year = {2009}
}
Comments
7 pages, 8 figures, Europhys. Lett., to be published, corrected two references