The torsional dependence of the magneto-impedance effect in current-annealed Co-rich amorphous wires

Abstract

We report in this work the behaviour of the magneto-impedance in twisted wires of amorphous that have been subjected to a current annealing with an applied tensile stress and have various induced anisotropies and saturation magnetostriction coefficients. The samples were annealed at 0.5 A for 1 min, with applied stresses in the range 100-800 MPa. The magneto-impedance is studied in the best frequency and current-amplitude ranges. High sensitivities to the applied magnetic field (up to ) and to the torsion (around ) are obtained.