Influence of the geometry on the performance of GMI in meander configuration

Abstract

The effect of geometry on Giant Magnetoimpedance effect (GMI) in a meander structure composed of three amorphous magnetic ribbons ((Co0.94 Fe0.06)72,5 Si12.5 B15; 20 mm length) connected electrically in series is analyzed. The impedance behavior under the meander configuration is compared with the sum configuration, namely, the sum of the impedance of each ribbon measured individually. The geometry effect in GMI response is examined by changing the distance, = 0.5, 1 and 2 cm, between ribbons in the meander. The highest GMI ratio is found for = 0.5 cm, with a gradual decrease for increasing distances. The lowest ratio corresponds to the sum configuration. The analysis of the results shows that this behavior of the GMI ratio, dominated by inductance, is determined by the overall negative contribution of the mutual inductance established between ribbons, and not by any intrinsic modification of the GMI effect in the meander structure.