A lateral array of ferromagnetic tunnel junctions is used to inject and detect non-equilibrium quasi-particle spin distribution in a superconducting strip made of Al. The strip width and thickness is kept below the quasi particle spin diffusion length in Al. Non-local measurements in multiple parallel and antiparallel magnetic states of the detectors are used to in-situ determine the quasi-particle spin diffusion length. A very large increase in the spin accumulation in the superconducting state compared to that in the normal state is observed and is attributed to a diminishing of the quasi-particle population by opening of the gap below the transition temperature.
@article{arxiv.cond-mat/0602141,
title = {Enhanced spin accumulation in a superconductor},
author = {M. Urech and J. Johansson and N. Poli and V. Korenivski and D. B. Haviland},
journal= {arXiv preprint arXiv:cond-mat/0602141},
year = {2015}
}
Comments
6 pages, 4 figures; accepted for publication in Journal of Applied Physics