Electric and Magnetic Properties of bcc Fe Based Multicomponent Alloys

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The electrical and magnetic properties of a bcc Fe1-xAx, system with the average atom formed by A = (Al, Si, V, Cr) are presented. Compositions were chosen to obtain alloys of simple structure with control parameter (x) covering some important Heusler alloys. Systematic changes in the residual resistivity, magnetic moments, and electronic structure with concentration x are observed. The so-called parallel-resistivity formula \rho^{-1}=\rho_{\text{ideal}}^{-1}+\rho_{\text{sat}}^{-1} was used for quantitative characterization of the concentrated alloys, where \rho_{\text{ideal}} denotes a contribution resulting from different mechanisms of scattering and \rho_{\text{sat}} represents a shunt resistivity. At small concentrations x, the main contribution comes from structural disorder. It is shown that the density of states at the Fermi level is substantially reduced at larger x in agreement with results of electronic structure calculations.
2012-06-15