Controlled Injection of Spin-Triplet Supercurrents into a Strong Ferromagnet

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Science  02 Jul 2010:
Vol. 329, Issue 5987, pp. 59-61
DOI: 10.1126/science.1189246

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The superconductor-ferromagnet proximity effect describes the fast decay of a spin-singlet supercurrent originating from the superconductor upon entering the neighboring ferromagnet. After placing a conical magnet (holmium) at the interface between the two, we detected a long-ranged supercurrent in the ferromagnetic layer. The long-range effect required particular thicknesses of the spiral magnetically ordered holmium, consistent with spin-triplet proximity theory. This enabled control of the electron pairing symmetry by tuning the degree of magnetic inhomogeneity through the thicknesses of the holmium injectors.

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