The frequency and stress dependence of giant magnetoimpedance in amorphous microwires

The magnetoimpedance of a glass coated amorphous microwire of nominal composition Co_83.2Mn_7.6Si_5.8B _3.3 was studied by changing a dc magnetic field within ±140 Oe and the frequency of the current up to 11 MHz. Giant magnetoimpedance effect was observed within a frequency range of -1-8 MHz with a maximum change of 53% around 4 MHz. The effect of axial tensile stress (maximum 566 MPa) on the magnetoimpedance of the sample was studied. The magnetic hysteresis loop of the same sample at different tensile stresses was also measured to understand the domain structure and the magnetoimpedance results of the microwire