Magnetization reversal process and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires

TL;DR

This study investigates the magnetization reversal and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires under AC current, revealing harmonic spectra and dependencies relevant for magnetic sensor design.

Contribution

It provides new insights into the harmonic responses and magnetic field dependencies in composite wires, aiding the development of sensitive magnetic field sensors.

Findings

Frequency spectrum contains even harmonics over a wide range of currents and fields.

Harmonic amplitudes strongly depend on the applied DC magnetic field.

Results are relevant for designing weak magnetic field sensors.

Abstract

The magnetization reversal of Cu/NiFe and Nb/NiFe composite wires carrying AC current is studied. The frequency spectrum of a voltage induced in a pick-up coil wound around the wire is analyzed. The frequency spectrum is shown to consist of even harmonics within a wide range of AC current amplitudes and longitudinal DC magnetic fields. The strong dependencies of the harmonic amplitudes on the DC field are found. The results obtained may be of importance for the design of weak magnetic field sensors.