First-principle prediction of half-metallic ferrimagnetism in Mn-based full-Heusler alloys with highly ordered structure

摘要

We have investigated the electronic and magnetic structures of Heusler alloys L2_1 Mn_2TiZ (Z=Al, As, Bi, Ga, Ge, Sb, Si, and Sn) using spin-polarized density functional theory within the generalized gradient approximation (DFT-GGA) for electron exchange and correlation. Our results show that the highlyordered Mn_2TiZ alloys have a half-metallic ferrimagnetic character at their respective equilibrium lattice constants. The calculated total magnetic moment is in good agreement with the Slater-Pauling rule, except for a small deviation.