Magnetostriction of pd-fe alloys

Abstract

The linear magnetostriction λs of polycrystalline Pd1-xFex alloys has been measured as a function of alloy composition, at temperatures of 300,77, and 4.2 K. The effect on λs of atomic ordering of Pd3Fe and PdFe type has been investigated. The value of λs is positive for x> 0.21, but changes sign three times in the composition range x < 0.21. This composition dependence can be understood semiquantitative1y in terms of the simple split-band model, where iron and palladium each have their own d band, distinct on the energy scale. Contributions to λs from electrons of both spin directions have been included. Best fit between theory and data is obtained for a value of the deformation potential of d electrons equal to - 0.6 eV. The anomalous Hall effect and the g factor of Pd-Fe are also discussed in the light of the split-band model.