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Giant triplet proximity effect in superconducting pseudo spin valves with engineered anisotropy

AuthorsWang, X. L.; Bernardo, Angelo di; Banerjee, N.; Wells, A.; Bergeret, F. S. ; Blamire, M. G.; Robinson, J. W. A.
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review B 89(14): 140508(R) (2014)
AbstractThe proximity coupling of a thin superconducting layer and an inhomogeneous ferromagnet can lead to a significant reduction of the critical temperature due to the generation of spin-polarized triplet Cooper pairs. We report critical temperature measurements of Co/Cu/NiFe(Py)/Cu/Nb superconducting pseudo spin valves (PSVs) in which the magnetization of the soft layer (Py) can be independently rotated in-plane with a magnetic field to create an angle (θ) between it and the magnetization of Co. Here we observe results consistent with spin-triplet theory and demonstrate large changes in ΔTC up to -120 mK as the Py layer is rotated from 0° (Co and Py are parallel) to 90° (Co and Py are orthogonal), which offers the potential for active control of the superconducting state. The key to this achievement is engineered magnetic anisotropy in Py, which enables well-defined control over the magnetization configuration of the PSV. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.89.140508
Identifiersdoi: 10.1103/PhysRevB.89.140508
e-issn: 2469-9969
issn: 2469-9950
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