The Influence of Series and Parallel Current Flowing Through Two Paralleled Co-based Amorphous Wires on Giant Magneto Impedance Effect

摘要

Background: Giant Magneto Impedance (GMI) is effectively enhanced by the mutual magnetic interaction between two wires arranged in parallel setup. The direction of current flowing through two wires (series or parallel current mode) has a key role in this change. Methods: The aim of this research is to study the GMI properties of series and parallel current flowing through two amorphous Co-based wires in parallel setup and compare it to a single wire. Therefore, the wires with stoichiometric formula Co 68.15 Fe 4.35 Si 12.5 B 15 were prepared by in-rotating water spinning method with diameter about 125 μm. Findings: The best GMI response measured in series current mode and 8 mm distance between two wires. The GMI ratio increases from 300% of single wire to 480% of two wires in series current mode. However when the current flowing through two wires is in parallel mode, the GMI ratio decreases to 180% which is due to reduction of effective magnetic field. For two-wire system in series current mode, the magnetic interaction is stronger than parallel current configuration. Application: These results demonstrate that the GMI response could be effectively improved in two-wire series current system, which is useful for the application of low dimension and high sensitive GMI sensors.