Current-Perpendicular-to-Plane Giant Magnetoresistance in Pseudo Spin Valves With $\hbox{Co}_{2}\hbox{Fe}(\hbox{Ge}_{0.5}\hbox{Ga}_{0.5})$ Heusler Alloy Ferromagnetic Layers and Cu/Ag Spacer
(Current-Perpendicular-to-Plane Giant Magnetoresistance in Pseudo Spin Valves With Co2Fe(Ge0.5Ga0.5) Heusler Alloy Ferromagnetic Layers and Cu/Ag Spacer)