Superconductor/ferromagnet (S/F) spin valve effect theories based on the S/F proximity phenomenon assume that the superconducting transition temperature Tc of F1/F2/S or F1/S/F2 trilayers for parallel magnetizations of the F1- and F2-layers (TcP) are smaller than for the antiparallel orientations (TcAP). Here, we report for CoOx/Fe1/Cu/Fe2/In multilayered systems with varying Fe2-layer thickness the sign-changing oscillating behavior of the spin valve effect \Delta Tc=TcAP-TcP. Our measurements revealed the full direct spin valve effect with TcAP>TcP for Fe2-layer thickness dFe2<1 nm and the full inverse (TcAP<TcAP) spin valve effect for dFe2>=1 nm. Interference of Cooper pair wave functions reflected from both surfaces of the Fe2-layer appear as the most probable reason for the observed behavior of \Delta Tc.
@article{arxiv.1101.4817,
title = {Manifestation of New Interference Effects in Superconductor/Ferromagnet Spin Valve},
author = {P. V. Leksin and N. N. Garifyanov and I. A. Garifullin and J. Schumann and V. Kataev and O. G. Schmidt and B. Buchner},
journal= {arXiv preprint arXiv:1101.4817},
year = {2015}
}