1. Torsion Dependence of Domain Transition and MI Effect of Melt-Extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 Microwires.
- Author
-
Xing, Dawei, Chen, Dongming, Liu, Fang, Liu, Jingshun, Shen, Hongxian, Ning, Zhiliang, Cao, Fuyang, and Sun, Jianfei
- Subjects
TORSION ,COBALT compounds ,ELECTRIC wire ,STRAINS & stresses (Mechanics) ,ELECTRIC impedance - Abstract
We present the torsional stress induced magnetoimpedance (MI) effect and surface domain structure evolution of magnetostrictive melt-extracted Co
68.15 Fe4.35 Si12.25 B13.25 Nb1 Cu1 microwires. Experimental results indicate that the surface domain structures observed by magnetic force microscope (MFM) transform from the weak circumferential domain of as-cast state to the helical domain under large torsional strain of 81.6 (2π rad/m). Domain wall movement distorts at torsional strain ξ=20.4 (2π rad/m) and forms a helical anisotropy with an angle of around 30° versus axial direction of wire. At 15 MHz, the maximum of GMI ratio ΔZ/Z(%) increases to 194.4% at ξ=20.4 (2π rad/m) from 116.3% of the as-cast state and then decreases to 134.9% at ξ=102.0 (2π rad/m). The torsion magnetoimpedance (TMI) ratio ΔZ/Zξ(%) is up to 290%. Based on this large torsional strain and high MI ratio, the microwire can be as an referred candidate for high-performance TMI sensor application. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF