Tuning Magnetoelastic Transition and Magnetostrictive Properties of FeRh Alloy by Fe Substitution for Rh

FeRh alloys undergo an antiferromagnetic-ferromagnetic magnetoelastic transition accompanied by significant volume change, and thus exhibit giant magnetostriction. However, few studies have explored how Fe substitution for Rh affects the transition behavior, magnetostrictive properties, and the correlation between their respective variations in this system. Herein, we systematically explore the magnetoelastic transition behavior and magnetostrictive properties of the Fe_50+xRh_50-x (x = 0, 0.25, 0.5) alloys. Experimental results demonstrate that the magnetoelastic transition temperature decreases, whereas both magnetostriction and its associated magnetic field response sensitivity increase with increasing Fe substitution. These findings provide an effective route to optimize the overall magnetostrictive performance of FeRh based alloys.