Effect of nanocrystallization on giant magnetoimpedance effect of Fe-based microwires

• Dependence of on magnetic properties of Fe-rich microwires on magnetoelastic energy.
• Systematic studies of the effect of annealing on GMI effect of Fe-rich microwires.
• Systematic studies of the effect of annealing on structure of Fe-rich microwires.
• Observation of the GMI effect in as-prepared microwires with nanocrystalline structure.

We studied giant magnetoimpedance (GMI) effect and magnetic properties of Fe70.8Cu1Nb3.1Si14.5B10.6 and Fe71.8Cu1Nb3.1Si15B9.1 Finemet microwires. We observed that GMI effect and magnetic softness of glass-coated microwires produced by the Taylor–Ulitovski technique can be tailored either controlling magnetoelastic anisotropy of as-cast FeCuNbSiB microwires, and/or controlling their structure by heat treatment or by changing the fabrication conditions. High GMI effect has been observed in as-prepared Fe-rich and heat treated microwires with nanocrystalline structure.