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Superconducting phase coherent electron transport in proximity conical ferromagnets

I. Sosnin·H. Cho·V. T. Petrashov·A. F. Volkov
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Abstract

We report superconducting phase-periodic conductance oscillations in ferromagnetic wires with interfaces to conventional superconductors. The ferromagnetic wires were made of Ho, a conical ferromagnet. The distance between the interfaces was much larger than the singlet superconducting penetration depth. We explain the observed oscillations as due to the long-range penetration of an unusual "helical" triplet component of the order parameter that is generated at the superconductor/ferromagnet interfaces and maintained by the intrinsic rotating magnetization of Ho.

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I. Sosnin, H. Cho, V. T. Petrashov, A. F. Volkov. 2005-11-03. Superconducting phase coherent electron transport in proximity conical ferromagnets. https://doi.org/10.1103/physrevlett.96.157002

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