Effect of Joule heating on GMI and magnetic properties of Fe-rich glass-coated microwires

A Gonzalez,P Corte-Leon,A Zhukov,M Ipatov,J M Blanco,V Zhukova

doi:10.1063/9.0000290

Abstract

Influence of Joule heating on magnetic properties and GMI effect of Fe75B9Si12C4 glass-coated microwires was studied. A decrease in coercivity after Joule heating is observed, while hysteresis loops of Joule heated samples maintain a rectangular shape. However, a remarkable increase in GMI ratio is observed in Joule heated samples. Observed GMI ratio improvement has been discussed considering magnetic anisotropy induced by Oersted magnetic field during Joule heating and internal stress relaxation. A remarkable GMI effect improvement observed in Joule heated Fe-rich microwires, along the fact that Fe is a more common, less expensive metal than Co, makes them suitable for magnetic sensor applications.

Highlights

Magnetic properties of amorphous ferromagnetic glass-coated microwires have been widely studied in the past few years, such as high magnetic softness, ultra-fast magnetization switching and domain wall (DW) propagation, inductive heating capabilities or Giant Magnetoimpedance effect
Their magnetic domain structure and, their Giant Magnetoimpedance (GMI) effect strongly depend on their λs –value and sign and the internal stresses value and spatial distribution
Magnetic bistability is usually denoted by perfectly rectangular loops, it has been shown that at high enough magnetic field frequencies, f, counterbalance between sweep rate, dH/dt, and switching time related to the domain wall propagation through the microwire causes this kind of change in microwires’ hysteresis loops

Summary

INTRODUCTION

Magnetic properties of amorphous ferromagnetic glass-coated microwires have been widely studied in the past few years, such as high magnetic softness, ultra-fast magnetization switching and domain wall (DW) propagation, inductive heating capabilities or Giant Magnetoimpedance effect.. Their magnetic domain structure and, their GMI effect strongly depend on their λs –value and sign (which are affected by the chemical composition) and the internal stresses value and spatial distribution. After appropriate annealing of Fe-based microwires a considerable increase in GMI ratio can be achieved.. After appropriate annealing of Fe-based microwires a considerable increase in GMI ratio can be achieved.6 This increase of GMI along the fact that Fe is a more common, cheap metal than Co raises its viability for GMI applications. In this paper we will report the effect of Joule heating on magnetic properties and GMI effect of Fe75B9Si12C4 microwires

EXPERIMENTAL DETAILS

EXPERIMENTAL RESULTS AND DISCUSSION

CONCLUSIONS