Superconducting phase coherent electron transport in proximity conical ferromagnets.
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.
Sosnin
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Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.
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Petrashov
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Volkov
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