Torque sensing using amorphous magnetostrictive wires

In this paper we present experimental results on the torsional dependence of amorphous magnetostrictive wires by using three different magnetic techniques in order to evaluate and compare them, namely magnetostrictive delay line, the stress-impedance and the domain wall nucleation and propagation techniques. We determined monotonic response in the stress-impedance and domain wall nucleation and propagation set-ups even in the as cast form. Concerning the magnetostrictive delay line, induced magnetic anisotropy was required to obtain monotonic response. The most sensitive response was obtained by using the delay line technique, although the power consumption was higher.