Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (12): 1236-1242.DOI: 10.1007/s40195-017-0617-0

Special Issue: 2017-2018非晶专辑

• Orginal Article • Previous Articles     Next Articles

Influence of Aspect Ratio on Giant Magnetoimpedance Effect for Fe67Co18Si11B4 Amorphous Ribbons

Yan-Hong Ding1, Ke Xue1, Wei-Yan Wang1, Xu Ma2,3()   

  1. 1 School of Electrical and Electronic Engineering, Tianjin Key Laboratory of Film Electronic and Communication Devices,Tianjin University of Technology, Tianjin 300384, China
    2 School of Material Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
    3 Tianjin Engineering Center of Near-Net-Shape Forming Technology for Metallic Materials, Tianjin 300402, China
  • Received:2017-02-16 Revised:2017-04-27 Online:2017-12-20 Published:2018-02-05

Abstract:

The effect of sample geometry aspect ratio (l/w) on the giant magnetoimpedance (GMI) in Fe67Co18Si11B4 amorphous ribbons was investigated systematically. The GMI profiles were measured as a function of the external magnetic field at different frequencies up to 110 MHz. The results show that there exists a critical aspect ratio ((l/w)0 = 5.4) below which the maximum GMI effect and sensitivity η decrease with decreasing l/w and above which the maximum GMI effect keeps almost constant and η decreases with increasing l/w. The observed dependence on aspect ratio as (l/w) < (l/w)0 is correlated with the magnetization process: Complex domain structures emerged near the ribbon ends to decrease the magnetostatic energy, modify the transverse permeability and consequently GMI response. Contributions from transverse permeability and resistance may dominantly determine the change of GMI effect as (l/w) > (l/w)0.

Key words: Amorphous, Magnetic property, Magnetoimpedance