Abstract
Melt extracted amorphous wires have a predominantly helical anisotropy due to residual tensile and torsional stresses quenched in the wire during casting. Consequently, their magnetoimpedance (MI) response is inadequate for linear detection of magnetic field. Several methods are used to accomplish this, both temporary (dc current biasing of the wire, tensile stress applied to the wire, or both) and permanent (current annealing of the wire, with or without applying a tensile stress). Their purpose is to optimize the MI response of these wires. The transverse (circumferential) anisotropy of the wire reaches an optimum in magnitude and orientation when a temporary method is used. This optimum can be quenched in the material using a permanent method. The MI response is characterized with the help of three criteria: sensitivity, figure of merit and peak amplitude per wire unit length. Magnetic field sensors with sensitivities as high as 75V∕(Tmm), figures of merit of about 0.5ΩT∕m, and peak amplitudes of 5Ω∕mm were obtained as a result of the enhancement of the MI response.
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