Magnetostriction and thermal expansion measurements on FeRh1−xPtx alloys

Abstract
We report high‐field magnetostriction and thermal expansion measurements in FeRh1−xPtx (x=0.75, 0.765, and 0.7) compounds. From the thermal expansion measurements we have observed the para‐ferromagnetic and ferro‐antiferromagnetic transitions for x=0.75 and 0.765, and the para‐antiferromagnetic transition in the 0.7 compound. The volume expansion associated with the first‐order transitions has been determined. The results of the magnetostriction measurements are complex and are explained here on the basis of an induced transition from an antiferromagnetic to a ferromagnetic state, induced by the applied magnetic field.