Magnetoimpedance

Giant magnetoimpedance phenomena is studied by means of inductance spectros copy in the 5Hz-13MHz frequency range at a constant ac current amplitude of 0.8 mA. The different magnetization mechanisms of a ferromagnetic amorphou s wire are resolved and it is found that domain wall bulging and wall dampi ng, constitute the more important issues for the low frequency behavior of GMI phenomena. At higher frequencies, domain wall movements are strongly da mped owing to eddy current losses and spin rotation mechanism becomes predo minant. An equivalent circuit approach is made to simulate the sample behav ior as a function of frequency and the circuit elements are associated with physical parameters of the sample.