  We report the superconducting properties of the Co/Pb/Co heterostructures
with thin insulating interlayers. The main specific feature of these structures
is the intentional oxidation of both superconductor/ferromagnet (S/F)
interfaces. We study variation of the critical temperature of our systems due
to switching between parallel and antiparallel configurations of the
magnetizations of the two magnetic layers. Common wisdom suggests that this
spin valve effect, which is due to the S/F proximity effect, is most pronounced
in the case of perfect metallic contact at the interfaces. Nevertheless, in our
structures with intentionally deteriorated interfaces, we observed a
significant full spin valve effect. A shift of the superconducting transition
temperature $T_c$ by switching the mutual orientation of the magnetizations of
the two ferromagnetic Co layers from antiparallel to parallel amounted to
$\Delta T_c =0.2$ K at the optimal thickness of the superconducting Pb layer.
Our finding verifies the so far unconfirmed earlier results by Deutscher and
Meunier on an F1/S/F2 heterostructure with oxidized interlayers
[https://doi.org/10.1103/PhysRevLett.22.395, G. Deutscher and F. Meunier, Phys.
Rev. Lett. 22, 395 (1969)] and suggests an alternative route to optimize the
performance of the superconducting spin valves.
