Superconducting spin-valve effect in heterostructures with ferromagnetic Heusler alloy layers

The transport properties of two types of spin valves are analyzed, in which the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al$_y$ was used as one of the two ferromagnetic layers in the F1/F2/S structures. The Heusler alloy layer was used: 1) as a weak ferromagnet, in the case of the F2 layer; 2) as a halfmetal, in the case of the F1 layer. In the first case, a large classical effect of the superconducting spin valve $\Delta T_c$ was obtained, which was facilitated by a significant triplet contribution to the effect of the superconducting spin valve $\Delta T_c^{\text{trip}}$. In the second case, a gigantic effect value $\Delta T_c^{\text{trip}}$ was found reaching 0.5 K.