Torsional dependence of second harmonic amplitude of giant magnetoimpedance in FeCoSiB amorphous wire

Summary form only given. The effect of torsional stresses in the magnetoimpedance response of a (Co/sub 0.94/Fe/sub 0.06/)/sub 72.5/Si/sub 12.5/B/sub 15/ amorphous wire (125 /spl mu/m and 5 cm in length) is analyzed in the present work. In particular, the occurrence of a second harmonic contribution of the magnetoimpedance voltage and its evolution upon the application of a torsional strain, /spl xi/, to the wire is analyzed and compared with the evolution of the first harmonic amplitude (impedance). The voltage drop across the sample and the current signal, obtained through a commercial current probe, were simultaneously recorded by a digital oscilloscope and analyzed through Fourier analysis. The experimental set-up enables the application of longitudinal magnetic fields by a long solenoid and the simultaneous application of torsional and tensile stresses to the sample.