Electronic structures and magnetic properties of near-equiatomic Co-Ti alloys

The magnetic properties of near-equiatomic Co-Ti alloys were studied by usi ng the first-principles electronic structure calculations. A formation of t he antistructure Co atom and its cluster plays an important role to determi ne the ferromagneti ferromagnetic behavior of the disordered equiatomic all oy or off-stoichiometric Go-rich alloys. A small but considerable amount of charge transfer from the Ti to Co atom is crucial to the structural stabil ity and the magnetic properties of the alloy system. A sharp peak in the ca lculated density-of-states curve near the Fermi level grows as the Ti conce ntration decreases, indicating a strong localization of the states, which g ives a better understanding of the change in physical properties upon an or der-->disorder transition.