title: Manifestation of new interference effects in a superconductor-ferromagnet spin valve.
abstract: 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 (T(c)(P)) are smaller than for the antiparallel orientations (T(c)(AP)). Here, we report for CoOx/Fe1/Cu/Fe2/In multilayers with varying Fe2-layer thickness the sign-changing oscillating behavior of the spin valve effect ΔT(c) = T(c)(AP) - T(c)(P). We observe the full direct effect with T(c)(AP) > T(c)(P) for Fe2-layer thickness d(Fe2) < 1 nm and the full inverse (T(c)(AP) < T(c((P)) effect for d(Fe2) ≥ 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 ΔT(c).
authors.affiliation: Zavoisky Physical-Technical Institute, Kazan Scientific Center of Russian Academy of Sciences, 420029 Kazan, Russia.
authors.forename: P V
authors.initials: PV
authors.lastname: Leksin
authors.forename: N N
authors.initials: NN
authors.lastname: Garif'yanov
authors.forename: I A
authors.initials: IA
authors.lastname: Garifullin
authors.forename: J
authors.initials: J
authors.lastname: Schumann
authors.forename: V
authors.initials: V
authors.lastname: Kataev
authors.forename: O G
authors.initials: OG
authors.lastname: Schmidt
authors.forename: B
authors.initials: B
authors.lastname: Büchner