Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1800967 | Journal of Magnetism and Magnetic Materials | 2012 | 5 Pages |
First-principles calculations have been performed on the electronic structures and magnetic properties of a new Ti2Co-based full-Heusler alloy Ti2CoGe. The calculations predict the Ti2CoGe is a half-metallic ferromagnet at the equilibrium lattice constant with the minority-spin energy gap of 0.60 eV. It is found that the total magnetic moment (Mt) and the number of valence electrons (Zt) in Ti2CoGe obey a new Slater–Pauling (SP) rule of Mt=Zt−18 and the rule also can be applied to other Ti2Co-based half-metallic full-Heusler alloys. The Ti2CoGe alloy keeps a 100% polarization at Fermi level and maintains the half-metallic character for lattice constants ranging between 6.05 and 6.67 Å.
► The Ti2CoGe alloy in CuHg2Ti-type structure is predicted to being half-metallic ferromagnetic nature. ► A new Slater–Pauling rule of Mt=Zt−18 in normal Ti2Co-based half-metallic full-Heusler alloys has been proposed. ► The half-metallic character of Ti2CoGe can be maintained for the range between 6.05 and 6.67 Å.