Effect of Joule heating on giant magnetoimpedance effect and magnetic properties of Co-rich microwires

The effect of Joule-heating on hysteresis loops and giant magnetoimpedance effect, GMI; of Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwire is studied. Joule heating performed at suitable conditions prevents the magnetic hardening observed during conventional furnace annealing of the studied microwires. A remarkable GMI ratio improvement is observed as compared to as-prepared annealed and even stress-annealed microwires. Observed magnetic softening and GMI ratio improvement have been discussed considering magnetic anisotropy induced by Oersted magnetic field during Joule heating and internal stresses relaxation. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

The influence of Joule heating on hysteresis loops and giant magnetoimpedance effect of Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwire was studied. Joule heating can prevent magnetic hardening and lead to a remarkable improvement in GMI ratio compared to conventional furnace annealing. The observed magnetic softening and GMI ratio improvement are attributed to magnetic anisotropy induced by the Oersted magnetic field during Joule heating and relaxation of internal stresses.