Giant tunneling magnetoresistance and quantum interference effect in ferromagnet/ferromagnet/s-wave superconductor junctions

► We study the TMR effect in FM/FM/s-wave SC junction at finite temperature for the first time. ► The so-called same-spin-band Andreev reflection plays a central role here. ► Giant TMR ratio (>106%, at T/Tc < 0.1) has been obtained. ► Quantum interference effect on TMR is also studied.