Onset of Magnetization Reversal in Glass-Covered CoSiB Microwires

Abstract

The jumps detected in the single-peak and the double-peak giant magnetoimpedance (GMI) ratio dependences of glass-covered CoSiB microwires have been identified as the complex shape pulses in a modified experiment of Sixtus and Tonks. The shape of the induced pulses is given by a combination of two processes: the irreversible movement of the single domain wall and the radial displacement of the transition region (90°-domain wall). The numerically calculated magnetic flux changes connected with the three characteristic pulses have shown that complex pulses of the second and thrid types are connected with the increase in the magnetic flux $\Delta \Phi $ , which corresponds to 10% change in value compared to the pulse of first type. Finally, this change also proves our assumption that during the rapid onset of magnetization reversal in soft ferromagnetic CoSiB microwires, the combination of displacements of the two domain walls occurs.