The influence of magnetic dipolar interaction on giant magnetoimpedance effect

Abstract

The giant magnetoimpedance (GMI) effect can be used to precisely investigate the magnetization process of samples. However, it is influenced by the magnetic interactions between the samples, among which dipolar interaction is a crucial factor to tune the GMI response and further design in magnetic device. Therefore, it is essential to study the impact of dipolar interaction on the GMI effect. Previous research was limited at the qualitative analysis. The introduction of the geometric factor between the strips and the application of the minimization of the free energy allowed for a quantitative analysis of their influence. Theoretical predictions and experimental results indicated that dipolar interaction led to an inward shift of the double peaks in the impedance curve and an increase in the maximum GMI ratio. This study enabled more accurate and precise analysis of the influence of dipolar interaction in both strip-shaped and filamentous-shaped magnetic samples on magnetic characterization. Thus, the GMI curve could expand our understanding of the internal interactions within magnetic materials and offer perspectives for the design and optimization of magnetic materials in practical applications.