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Influence of applied tensile stress on the magnetic behaviour of Co‐rich amorphous microwires

It is shown that Co‐rich microwires with definitely negative magnetostriction have nearly linear axial magnetization curves with a very small remanence, because they are magnetized circumferentially in the absence of an applied magnetic field. For these wires a complete set of material parameters, i.e. saturation magnetization, magnetostriction constant and characteristic amplitude of the residual quenching stress is obtained by means of careful measurement of the wire response under tensile stress to slowly varying applied magnetic field. Using the same technique we demonstrate also the existence of a longitudinally magnetized core for Co‐rich wires having hysteresis loops with finite remanence. The finite remanence for these wires is explained assuming the magnetostriction coefficient to be radial dependent, so that it may change sign in a certain internal point along the wire radius. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)