抄録
Measurements have been made of the magneto-resistivity and the temperature coefficient of the electrical resistivity in the Fe–Ni alloys containing 33∼42 at%Ni over the temperature range between 77 K and the Curie temperature. On the basis of the analysis inclusive of the forced volume magnetostriction, it becomes evident that the magneto-resistivity in the 42 at%Ni alloy is well explained in terms of the spin disorder scattering, while in the 33∼40 at%Ni the magnetovolume effect considerably contributes. This concentration dependence may be understood by assuming an additional contribution to the conduction electron scattering due to local spin disordered states in the alloys below 40 at%Ni as well as the normal spin disorder scattering. Furthermore, the spontaneous volume strain contribution is indicated to be required for understanding of the temperature coefficient of the resistivity.
