The effect of surface crystalline layers on asymmetric off-diagonal magnetoimpedance in field-annealed CoFeSiB amorphous ribbons

Influence of current amplitude on the nonlinear asymmetric ac volt–ampere characteristics in amorphous ribbons with GMI effect

“…The V 21 /V 0 or V 22 /V 0 versus H x curves are both asymmetric with two peaks. This has been confirmed by experiments [8,23]. These experiments found that field dependence of the impedance in the field-annealed CoFeSiB in the air is asymmetric two-peak, with the peak at the positive field being higher than the peak at the negative field.…”

Asymmetric off-diagonal magnetoimpedance in field-annealed amorphous ribbons: Analysis of bias current effect

“…During the annealing, one side of the ribbon was in the air (the air-side) and the other side was located on the substrate (the wheel-side), which may result in the difference in the crystalline layers thickness. The assumption on the different thickness of the crystalline layers has been verified recently by means of the off-diagonal magnetoimpedance measurements for the ribbons with the surface layers removed by etching at one side [34]. It has been observed that the evolution of the offdiagonal magnetoimpedance response differs significantly for the air-side etched and wheel-side etched ribbons.…”

“…It has been observed that the evolution of the offdiagonal magnetoimpedance response differs significantly for the air-side etched and wheel-side etched ribbons. The analysis of the experimental data has shown that the thicker crystalline layer corresponds to the air-side of the ribbon [34].…”