Effect of substitution of Mn with Fe or Cr in Hensler alloy of Co2MnSn

Crystallographic and magnetic properties Of Co2Mn1-xFexSn and Co2Mn1-y CrySn Hensler alloys were studied using x-ray diffraction, scanning electron microscopy with energy dispersive x-ray analysis, magnetization measurements and Mossbauer spectroscopy. We found that the intermetallic compounds crystallize into a single phase with the L2(1) -type Heusler structure at the concentration of 0 <= x <= 0.5 for Co2Mn1-xFexSn and 0 <= y <= 0.3 for Co2Mn1-yCrySn. The spontaneous magnetization increases when Mn is substituted with Fe and decreases when Mn is substituted with Cr. The values of hyperfine field at the Sn nuclear sites in Co2Mn1-xFexSn and Co2Mn1-yCrySn also increase or decrease in combination with the size of magnetization. These measurements suggest that the Slater-Pauling behaviour in half-metallic full-Heusler alloys provides a good description of the substitution effect of Mn with Fe or Cr.