Abstract
The impedance and impedance-phase in (Co0.85Fe0.06Nb0.02Ni0.07)75Si10B15 amorphous ribbon strongly depend on the dc magnetic field. The change ratios of magnetoimpedance ΔZ(H)/Z(0), magnetoresistance ΔR(H)/R(0) and magnetoreactance ΔX(H)/X(0) intersect at frequencies, where the change ratio of the magnetoimpedance-phase Δθ(H)/θ(0) is zero. There are two intersecting points, which occur near the frequencies of peak and valley of ΔZ(H)/Z(0), respectively. With increasing dc fields, the intersecting frequencies as well as the peak-frequencies of magnetoimpedance shift to higher frequencies. The simulation of magnetoimpedance for magnetic ribbons was done considering the combination influence of skin effect and relaxation permeability spectra. The negative linear magnetoimpedance at low frequencies, the peak-phenomenon of impedance with field at high frequencies, as well as the intersection of the magnetoimpedance, magnetoresistance and magnetoreactance were well simulated.
