Engineering of magnetic properties and domain wall dynamics in Fe-Ni-based amorphous microwires by annealing

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

doi:10.1063/1.5130173

Abstract

We present experimental studies related to the influence of annealing on domain wall (DW) dynamics and magnetic hysteresis of Fe-Ni-rich microwires. As-prepared and annealed Fe62Ni15.5Si7.5B15 and Fe49.6Ni27.9Si7.5B15 microwires present perfectly rectangular hysteresis loops and single DW propagation. DW velocity, v, DW mobility, S, and coercivity, Hc, of both studied microwires have been considerably affected after annealing. In Fe62Ni15.5Si7.5B15 microwires, we observed a gradual S increase with annealing time, tann, increasing. However, a non-monotonic S (tann) dependence was observed in Fe49.6Ni27.9Si7.5B15 microwires. We discussed observed dependencies in terms of different magnetoelastic anisotropy, domain walls stabilization, and different Curie temperatures of studied microwires.

Highlights

Magnetic microwires prepared by rapid melt quenching exhibit excellent magnetic characteristics, such as tunable soft magnetic properties, Giant magnetoimpedance (GMI) effect and extremely fast single domain wall (DW) propagation
The origin of such magnetic bistability relies on the core-shell domain structure of magnetic microwires, which consists of a single axially magnetized inner domain surrounded by an outer domain shell with transverse magnetic anisotropy
The magnetization reversal within this inner single domain is attributed to the depinning and fast DW propagation within an inner single domain upon application of external magnetic field

Summary

INTRODUCTION

Magnetic microwires prepared by rapid melt quenching exhibit excellent magnetic characteristics, such as tunable soft magnetic properties, Giant magnetoimpedance (GMI) effect and extremely fast single domain wall (DW) propagation. The latter is related to either spontaneous or induced magnetic bistability observed in magnetic wires prepared by rapidly melt quenching. The origin of such magnetic bistability relies on the core-shell domain structure of magnetic microwires, which consists of a single axially magnetized inner domain surrounded by an outer domain shell with transverse magnetic anisotropy. Magnetic microwires prepared by rapid melt quenching exhibit excellent magnetic characteristics, such as tunable soft magnetic properties, Giant magnetoimpedance (GMI) effect and extremely fast single domain wall (DW) propagation.. Magnetic microwires prepared by rapid melt quenching exhibit excellent magnetic characteristics, such as tunable soft magnetic properties, Giant magnetoimpedance (GMI) effect and extremely fast single domain wall (DW) propagation.1–5 The latter is related to either spontaneous or induced magnetic bistability observed in magnetic wires prepared by rapidly melt quenching.. Fe-Ni-based alloys are commonly used for preparation of amorphous ribbons.. Fe-Ni-based alloys are commonly used for preparation of amorphous ribbons.17,18 Beyond this system, we have reported earlier that Fe-Ni based microwires displayed fast DW dynamics.. Scitation.org/journal/adv particular composition. in this paper we present our latest experimental results on influence of annealing conditions on DW dynamics and hysteresis loops of two different Fe-Ni based glass-coated microwires

EXPERIMENTAL DETAILS

RESULTS AND DISCUSSION

CONCLUSIONS