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The current perpendicular to film plane type giant magnetoresistance (CPP-GMR) effect in Co2Fe0.4Mn0.6Si/Ag83Mg17/Co2Fe0.4Mn0.6Si junctions was investigated. An epitaxially grown 5-nm-thick Ag83Mg17 film having partially ordered L12 structure was fabricated on the Co2Fe0.4Mn0.6Si layer by magnetron sputtering. CPP-GMR effects were observed in the submicrometer-sized junctions, and the maximum value of the observed (intrinsic) MR ratio was 40% (48%) at room temperature. The average change in the resistance–area product was 23 mΩ·µm2 for the Ag–Mg junctions, which was higher than those of conventional CPP-GMR junctions using a Ag spacer layer. [ABSTRACT FROM AUTHOR]