Long range spin supercurrents in ferromagnetic CrO$_2$ using a multilayer contact structure

Details Long range spin supercurrents in ferromagnetic CrO$_2$ using a multilayer contact structure Long range spin supercurrents in ferromagnetic CrO$_2$ using a multilayer contact structure

2011-11-24

arxiv.org/abs/1111.5809v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures

Scientific paper

e report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO$_2$ deposited on TiO$_2$ substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO$_2$. Here we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo$_{70}$Ge$_{30}$ electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO$_2$ layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.

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