Contributions to giant magnetoimpedance from different domain regions of Co68.15Fe4.35Si12.5B15 amorphous wire

The frequency dependence of magnetoimpedance (MI) of amorphous wire Co68.15Fe4.35Si12.5B15 has been studied in the presence of various tensile stresses up to 285MPa to understand the contributions to giant magnetoimpedance from different domain regions. The external stress affects MI of these materials to a large extent as magnetocrystalline anisotropy is absent and magnetoelastic anisotropy is the main source of anisotropy in these materials. At a particular frequency, a stress-induced anisotropy changes the domain structure, magnetization dynamics, and hence MI. Single peak MI characteristics obtained at lower frequencies (approximately a few kilohertz) are changed to a double-peak behavior with the application of a tensile stress or increase in frequency. Asymmetry between the two peaks has also been developed only by sending a dc of 5mA. Hysteresis loop measurement of amorphous wire at various frequencies and tensile stresses helps us understand the MI results.