Effect of the wire length on the torsion impedance in Fe-rich wires

In this work, we show the results of measuring the impedance as a function of the applied torsion on amorphous Fe_73.5Si_13.5B₉Cu₁Nb₃ wires with a 133 μm diameter and lengths between 2 and 10 cm. A decrease of the impedance value can be observed as a consequence of the decrease of the wire length, and sensitivities to the applied torsion up to 57%/rad/cm can be measured at a drive current frequency of 2 MHz.