Study on Soft Magnetic Properties and Gmi Properties of Cofenbsib Amorphous Microwires Under Joule Heating

In this study, continuous and uniform Co-based amorphous microwires were successfully synthesized by the modified TU method and followed by Joule heating process at a DC current range of 5 ~ 30 mA. The microstructure, magnetic properties, and giant magneto-impedance (GMI) effect of the microwires were thoroughly investigated. The microstructure analysis showed that the microwire changed from amorphous to nanocrystalline after Joule heating, with a size of about 50 ~ 80 nm. Concurrently, the saturation magnetization experienced a notable increase, from 63 emu/g to 73 emu/g. The GMI sensing system, constructed based on the direct measurement method, demonstrated that a maximum GMI ratio was reached 340% when the excitation voltage is set to 0.2 V at 10 MHz under the 10 mA annealing condition. The maximum magnetic field response sensitivity of up to 235%/Oe, signifying its potential as a high-performance GMI sensor.

Keywords: Amorphous microwire, GMI sensor, DC Joule heating, Nanocrystallization, Soft magnetic properties

Suggested Citation: Suggested Citation

Lv, Minghao and Li, Shuangyou and Zong, Shuotong and Liu, Hongxia and Liu, Lingfang and Cheng, Lin and Zhai, Lijun and Zhang, Yan and Sun, Zhigang, Study on Soft Magnetic Properties and Gmi Properties of Cofenbsib Amorphous Microwires Under Joule Heating. Available at SSRN: https://ssrn.com/abstract=5129671 or http://dx.doi.org/10.2139/ssrn.5129671