Spin-triplet supercurrent in Co/Ni multilayer Josephson junctions with perpendicular anisotropy
E. C. Gingrich, P. Quarterman, Yixing Wang, R. Loloee, W. P. Pratt, Jr., Norman O. Birge
DOI 10.1103/PhysRevB.86.224506 · Physical Review B
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Abstract
We have measured spin-triplet supercurrent in Josephson junctions of the form S/F′/F/F′/S, where S is superconducting Nb, F′ is a thin Ni layer with in-plane magnetization, and F is a Ni/[Co/Ni]n multilayer with out-of-plane magnetization. The supercurrent in these junctions decays very slowly with F-layer thickness and is much larger than in similar junctions not containing the two F′ layers. Those two features are the characteristic signatures of spin-triplet supercurrent, which is maximized by the orthogonality of the magnetizations in the F and F′ layers. Magnetic measurements confirm the out-of-plane anisotropy of the Co/Ni multilayers. These samples have their critical current optimized in the as-prepared state, which will be useful for future applications.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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