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The half metallic properties of T i 2 CoSn full-Heusler compound is studied within the framework of the density functional theory with the Perdew Burke Ernzerhof generalized gradient approximation (GGA). Structural optimization was performed and the calculated equilibrium lattice constant is 6.340Ȧ. The spin up band of compound has metallic character and spin down band is semiconducting with an indirect gap of 0.598 eV at equilibrium lattice constant. For the lattice parameter, ranging from 6.193 to 6.884Ȧ the compound presents 100% spin polarization and a total magnetic moment of 3µ B .

The electronic and magnetic properties of T i 2 CoSi Heusler compound are investigated using density functional calculations. The optimized lattice constant is found to be 6.030Ȧ. The compound is a half-metallic ferromagnet with an energy gap in minority spin channel of 0.652 eV at equilibrium lattice constant, which leads to a 100% spin-polarization. The obtained total magnetic moment from spin-polarized calculations is 3.0 µ B for values of lattice constants higher than 5.941Ȧ. The half-metallicity is spoiled for a compressed volume of 4%, suggesting a possible application as pressure sensitive material.

Within the framework of density functional theory, the electronic structure and magnetic properties have been studied for the Ti2FeSn full-Heusler compound. The ferromagnetic state is found to be energetically more favorable than paramagnetic and antiferromagnetic states. The spin-polarized results show that Ti2FeSn compound has half-metallic ferromagnetic character with a total spin moment of 2µ B and a band gap in the minority spin channel of 0.489 eV, at the equilibrium lattice constant a=6.342Ȧ.