Using first-principles calculations we investigated the electronic structure, magnetic properties, and structural stability of ternary Co-Mn-Fe alloys in their disordered body-centered cubic structures. The robustness of the presence of the spin-polarized ${\mathrm{\Delta }}_1$ band at the Fermi level is confirmed for a wide range of chemical compositions, which is beneficial in obtaining a large tunneling magnetoresistance ratio when utilized as the electrode materials for a MgO-based magnetic tunnel junction (MTJ). Very high ferromagnetic transition temperature ($>1000\mathrm{K}$) evaluated on the basis of a mean-field approximation is reported here, which will effectively reduce the thermal fluctuation of the spin moments at the interface with MgO. A remarkably low value of Gilbert damping constant ($\sim {10}^{-4}$) has been obtained in this study. Furthermore, the Co-Mn-Fe alloys possess a sizably large perpendicular magnetic anisotropy when they are tetragonally distorted. These findings support the viability of the Co-Mn-Fe alloys as a potential candidate for the electrode materials in the MgO-based MTJ.

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• Density of states
• Electronic structure
• Fermi surface
• First-principles calculations
• Magnetic anisotropy
• Magnetism
• Spintronics
• Magnetic tunnel junctions