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VOLUME 97 (2013) | ISSUE 8 | PAGE 549
Peculiarities of performance of the spin valve for the superconducting current
The spin valve effect for the superconducting current based on the superconductor/ferromagnet proximity effect has been studied for a CoOx/Fe1/Cu/Fe2/Cu/Pb multilayer. The magnitude of the effect Δ Tc =TcAP -TcP, where TcP and TcAP 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 dFe1. The obtained dependence of the effect on dFe1 reveals that Δ Tc 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_{\text{Fe1}}\sim d_{\text{Fe2}}. At the optimal value of dFe1 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.