Abstract <p>A comprehensive approach is used to evaluate the magnetoimpedance response of the CoFeSiB–SiO₂–Al–SiO₂–CoFeSiB multilayer magnetic structure. This approach is based on a combination of numerical calculation of the magnetic field produced by the AC electric current flowing through the AI busbar and micromagnetic simulation of the spin dynamics induced by this field in an amorphous CoFeSiB shell in the presence of an external DC magnetic field applied along the current direction (TL)/perpendicular to the current direction (TT). As both the amplitude of the current and the magnitude of the external field increase in each (TL/TT) configuration, a nonlinear rise in the peak value of the output signal is observed. Such a process is accompanied by a phase shift and a change in the signal shape, which acquires a character different from the sine wave. This effect is associated with the features of nonlinear dynamics of the magnetization vector component collinear to the current, which lead to an enhancement of the contribution of high-order harmonics to the signal. At a current with an amplitude of 12.3 mA, an increase in the external field from 1 to 5&#xa0;Oe results in a rise in the maximum output voltage from 3.8 to 67.5 mV for the TL configuration and from 0.06 to 1.11 mV for the TT configuration. The transition to the nonlinear excitation mode of the structure by a current of higher amplitude (37 mA) in a small magnetic field (~1 Oe) provides a more pronounced jump in the peak output voltage, reaching up to 146 and 1.78 mV in the TL and TT configurations, respectively. The relatively small voltage peak in the case of the TT configuration is due to a weak contribution to the dynamics of one of the CoFeSiB layers, in which the orientation of the spins in the AC field coincides with the direction of the external magnetic field.</p>