Abstract
A magnetic anisotropy is very important in the development of sensitive magnetoimpedance (MI) sensors. According to changes in the direction and energy of magnetic anisotropy, the changes in permeability result in impedance variation. Hence, an understanding of relationship between structure of magnetic anisotropy and impedance variation is required for the development of MI sensors. However, the relationship has not been considered so far. Therefore, we analyzed both impedance variation and magnetic domain. The minimum impedance appeared with transversely induced magnetic anisotropy, and the maximum value of the impedance was observed when the magnetic moments of approximately 84% rotated longitudinally. Through the magnetic domain observation and the variations in the impedance, we carried out quantitative analysis of magnetic properties on the FeSiB layer with an MI sensor using impedance, hysteresis loop, and magnetic domain analysis.
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