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

M. S. Anwar; M. Veldhorst; A. Brinkman; J. Aarts

doi:10.1063/1.3681138

paper

Long range spin supercurrents in ferromagnetic CrO $_{2}$ using a multilayer contact structure

arXiv:1111.5809 · doi:10.1063/1.3681138

Abstract

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.

3 pages, 4 figures

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A spin triplet supercurrent through the half-metallic ferromagnet CrO2

Long range spin supercurrents in ferromagnetic CrO2​ using a multilayer contact structure

Abstract

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Long range spin supercurrents in ferromagnetic CrO $_{2}$ using a multilayer contact structure