Wiedemann effect of Fe–Ga based magnetostrictive wires

(Fe₈₃Ga₁₇)₉₈Cr₂ wires each with a diameter of 0.7 mm are prepared by hot swaging and warm drawing from the casting rods directly, because the ductility of Fe₈₃Ga₁₇ alloy is improved by adding Cr element. The Wiedemann twists and dependences on magnetostrictions of Fe₈₃Ga₁₇ and (Fe₈₃Ga₁₇)₉₈Cr₂ wires are investigated. The largest observed Wiedemann twists of 245 s·cm^-1 and 182 s·cm^-1 are detected in the annealed Fe₈₃Ga₁₇ and (Fe₈₃Ga₁₇)₉₈Cr₂ wires, respectively. The magnetostrictions of the annealed Fe₈₃Ga₁₇ and (Fe₈₃Ga₁₇)₉₈Cr₂ wires are 160 ppm and 107 ppm, respectively. The maximum of Wiedemann twist increases with magnetostriction increasing. However the magnetostriction is just an important factor that affects the Wiedemann effect of alloy wire, and the relationship between magnetostriction and Wiedemann effect is a complex function rather than a simple function.