Abstract
The discovery of giant magneto-impedance (GMI) in soft magnetic amorphous wires and films has opened new horizons in the development of micromagnetic sensors operating at nano-Tesla range. Asymmetrical GMI (AGMI) is very important to further improve sensor performance in terms of linearity and sensitivity. This paper presents a review on AGMI in Co-based amorphous wires with two types of anisotropy: circumferential and helical. Physical concepts of AGMI supported by theoretical and experimental results and problems of significant practical importance are discussed.
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