Current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) heterostructures were fabricated using half-metallic Co2Fe0.4Mn0.6Si (CFMS) ferromagnetic electrodes and dual Ag-Mg spacers. The magnetic properties and (001)-epitaxial growth of the CFMS films were investigated in the whole CPP-GMR stacks. A large intrinsic CPP-GMR ratio of 73% (observed CPP-GMR value: 63%) at room temperature was achieved in the nanopatterned CPP-GMR junctions. The change in resistance-area product (ΔRA) value of the junctions was enhanced to 27 mΩ·μm2. The large CPP-GMR effect in the dual-type CPP-GMR heterostructures could be attributed to their enhanced interfacial spin asymmetry scattering owing to the increased CFMS/Ag-Mg interfaces. The temperature dependence of the CPP-GMR effect was also studied, and a local maximum CPP-GMR ratio of 175% with a ΔRA value of 47 mΩ·μm2 was observed at low temperatures. This work indicates that the dual-type CPP-GMR devices made up of CFMS electrodes and Ag-Mg spacers could be promising for future spintronic applications.
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