Peculiarities of performance of the spin valve for the superconducting current
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The spin valve effect for the superconducting current based on the superconductor/ferromagnet proximity effect has been studied for a CoO x /Fe1/Cu/Fe2/Cu/Pb multilayer. The magnitude of the effect ΔT c = T c AP − T c P , where T c P and T c AP are the superconducting transition temperatures for the parallel (P) and antiparallel (AP) orientation of magnetizations, respectively, has been measured for different thicknesses of the Fe1 layer d Fe1. The obtained dependence of the effect on d Fe1 reveals that ΔT c can be increased in comparison with the case of a half-infinite Fe1 layer considered by the previous theory. A maximum of the spin valve effect occurs at d Fe1 ∼ d Fe2. At the optimal value of d Fe1 almost full switching from the normal to the superconducting state when changing the mutual orientation of magnetizations of the iron layers Fe1 and Fe2 from P to AP is demonstrated.
KeywordsJETP Letter Superconducting State Spin Valve Iron Layer Superconducting Current
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