  Josephson devices with ferromagnetic barriers have been widely studied. Much
less is known when the ferromagnetic layer is insulating. In this manuscript we
investigate the transport properties of superconductor-ferromagnetic
insulator-superconductor (SFIS) junctions with particular attention to the
temperature behavior of the critical current, that may be used as a fingerprint
of the junction. We investigate the specific role of impurities as well as of
possible spin mixing mechanisms, due to the spin orbit coupling. Transition
between the 0 and the $\pi$ phases can be properly tuned, thus achieving stable
$\pi$ junctions over the whole temperature range, that may be possibly employed
in superconducting quantum circuits.
