Josephson Junctions with a synthetic antiferromagnetic interlayer
arXiv:0905.2156 · doi:10.1103/PhysRevB.80.020506
Abstract
We report measurements of the critical current vs. Co thickness in Nb/Cu/Co/Ru/Co/Cu/Nb Josephson junctions, where the inner Co/Ru/Co trilayer is a "synthetic antiferromagnet" with the magnetizations of the two Co layers coupled antiparallel to each other via the 0.6 nm-thick Ru layer. Due to the antiparallel magnetization alignment, the net intrinsic magnetic flux in the junction is nearly zero, and such junctions exhibit excellent Fraunhofer patterns in the critical current vs. applied magnetic field, even with total Co thicknesses as large as 23 nm. There are no apparent oscillations in the critical current vs. Co thickness, consistent with theoretical expectations for this situation. The critical current of the junctions decays over 4 orders of magnitude as the total Co thickness increases from 3 to 23 nm. These junctions may serve as useful templates for future explorations of spin-triplet superconducting correlations, which are predicted to occur in supercon- ducting/ferromagnetic hybrid systems in the presence of certain types of magnetic inhomogeneity.
4 pages, 5 figures
References in corpus (11)
- Proximity effects in superconductor-ferromagnet heterostructures
- Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
- A spin triplet supercurrent through the half-metallic ferromagnet CrO2
- Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
- Superconducting phase coherent electron transport in proximity conical ferromagnets
- Critical Current Behavior in Josephson Junctions with the Weak Ferromagnet PdNi
- Critical current of a Josephson junction containing a conical magnet
- Odd triplet superconductivity in a superconductor/ferromagnet structure with a spiral magnetic structure
- Josephson current in a superconductor-ferromagnet junction with two non-collinear magnetic domains
- Josephson tunnel junctions with ferromagnetic $\Fe_{0.75}\Co_{0.25}$ barriers
- 0-pi transition in SFS junctions with strongly spin-dependent scattering
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- Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers. II. Canted magnetization
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