Frequency dependence of output voltage generated from bundled compound magnetic wires

The output voltage generated from bundles of twisted Vicalloy wires was studied. When the magnetically soft layers of the wires were reversed by an applied external magnetic field, a pulse voltage, owing to a large Barkhausen jump, was induced in a search coil wound around the wires. The output did not depend on the exciting frequency of the applied field for the bundled wires with n (number of bundled wires) <5. The frequency dependence for n=10 was attributed to the demagnetizing field in the thicker shape of the bundle. The bundled wires of n=25 exhibited dispersed peaks in output waveform due to a self-biasing effect, which was advantageous for obtaining a rectangular output waveform.