Extraordinary Hall effect in Ni-Fe-Cr ternary alloys

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Abstract
The Hall resistivity, the ohmic resistivity and the saturation magnetization have been measured in Ni‐Fe‐Cr ternary alloys at 300K and 77K. The ’split‐band model’ predicts a line on the Ni‐Fe‐Me ternary diagram (Me=V, Cr, Mo, W) along which the Fermi level passes through the point of intersection of Ni and Fe spin‐down bands. The extra‐ordinary Hall conductivity γHs and the linear magnetostriction λs are supposed to pass through zero values and change their signs while crossing the line. Our data shows that the experimental γHs?0 line is far below the theoretical line and may be slightly below the experimental λs?0 line. The values of the Curie temperature Tc and the magnetization Ms vary roughly linearly with Cr content. Ms is calculated on the basis of Fridel’s theory of virtually bound states of Cr. The agreement with experiments is good for temperatures well below Tc.