Saturation moments and residual resistivities of iron-cobalt ternary alloys

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Abstract
The addition of Ni, Cu, Ti, V or Cr to the equiatomic composition FeCo leads to a reduction of the mean saturation moment of the ternary alloys at progressively increasing rates. But, because of a ferromagnetic spin coupling with the solvent atoms and a large localized moment, Mn uniquely exerts an increasing effect on the saturation magnetization of the FeCo alloys. All solute elements raise the residual resistivity at the rates of 0.3, 0.5, 1.3, 13, 16 and 22 microhm-cm per atomic percent of Cu, Ni, Mn, Ti, V and Cr respectively. The magnetic and electrical data permit an elucidation of the electronic structures of the ternary alloys. The band structure of the 3d electrons in the matrix is reflected by the ease with which the solute atoms of Ti, V, Mn and Cr are able to donate electrons to and the Ni atoms accept electrons from the matrix. The electron configuration of the d shell of the solute atoms falls into three groups: (1) completely full in Cu and Ni; (2) half full in Mn; and (3) completely empty in Ti, V and Cr. Such configurations are consistent with the energy requirements for stability.