Giant magneto-impedance effect and frequency dependence of magnetization processes in NiFeCoP/BeCu composite wire

The NiFeCoP/CuBe composite wire is produced by electroless-deposition. The composite wire shows distinct magnetoimpedance effect at low frequency. The maximal GMI ratio is 40% at 20 kHz and about 97% at 180 kHz. The frequency dependence of magnetization in NiFeCoP composite wire is analyzed in terms of equivalent circuits and complex permeability. The relaxation frequency of the composite wire is about 1 MHz. The displacement of domain wall can be damped by the DC applied field. So the effect of the DC applied field is to eliminate the parallel RL circuit.