Giant magneto-impedance variation in amorphous CoFeSiB ribbons as a function of tensile stress and frequency

GMI percentage variation and saturated magnetoelastic constant are calculated for Co68.15Fe4.35Si12.5B15 amorphous ribbon with different applied longitudinal tensile stress. Calculated location and height of the two peak GMI curves are in a good agreement with experimental peaks. Frequency dependence calculations related to the GMI percentage variation for Co68.15Fe4.35Si12.5B15 amorphous ribbon shows that the magnitude of the peak in GMI curves increases with increasing frequency, but for frequencies in the range of 15-20 MHz and higher, the height of the peaks in GMI curve remains unchanged. The calculated behavior shows that the maximum impedance value increases as a function of frequency, reaches to its maximum in the range of 15-20 MHz and then decreases with increasing frequency. The location of calculated maximum value for impedance and slop of theoretical and experimental curves are in a good agreement. (C) 2020 Elsevier B.V. All rights reserved.