Abstract
Abstract A very high giant magnetoimpedance (GMI) up to 420% and sensitivities up to 60%/Oe have been achieved in commercial Vitrovac® 6025 Co67Fe4Mo1.5Si16.5B11 amorphous ribbons. A relatively low frequency range of 0.5–10 MHz and driving current intensities between 1.5 and 15 mA in combination with high sensitivities, low GMI hysteresis with respect to external magnetic field make this material very attractive for low field sensing processes. Special treatments under load without heating result in additional stability and favorable noise to signal ratio. We explain these outstanding GMI properties taking into account extra uniform magnetization processes and longitudinal magnetic anisotropy. The complex study of the magnetic and GMI properties shows, that equilibrium of various parameters of GMI medium is an additional guarantee of stable functionality.
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