Exploring stress-dependent impedance behavior via magnetization dynamics in amorphous magnetic fibers in high frequency: Experimental and modeling

Abstract

The magnetoelastic effect plays a crucial role in influencing the magnetization dynamics and impedance characteristics of magnetic fibers (MFs). In this work, we investigate the modulation of the domain structure and impedance behaviors under stress within Co-based MFs aided by experimental and theoretical approaches. The remarkable changes of natural ferromagnetic resonance and the transition of domain inclination angles indicate that the stress-impedance effect derives from the evolution of the magnetic domain structure and anisotropy field, which are induced by magnetoelastic coupling. The ferromagnetic resonance linewidths over a range of applied tensile strains (0–0.54%) serve to elucidate the contribution of magnetoelastic coupling to magnetic damping in ferromagnetic fibers. By utilizing the shell domain expansion method, we derive circular dynamic permeability and compute the impedance properties at high frequencies of MFs under multi-field stimulus. The theoretical model accurately predicts key features of magnetization dynamics, the evolution of ferromagnetic resonance, and impedance curves of MFs, in good agreement with experimental results including very fine observation of domain evolution. This comprehensive approach provides profound insights into the stress modulation of impedance characteristics, with implications for sensing applications of MFs.