Abstract
We studied the correlation of magnetic properties, structure, and giant magnetoimpedance (GMI) effect in Finemet-type FeCuNbSiB microwires. We observed that the GMI effect and magnetic softness of glass-coated microwires produced by the Taylor–Ulitovsky technique can be tailored by heat treatment. We observed a considerable magnetic softening of studied microwires after annealing. This magnetic softening correlates with the devitrification of amorphous samples. Amorphous Fe-rich microwires exhibited a low GMI effect (GMI ratio below 1%). Considerable enhancement of the GMI effect (GMI ratio up to 125%) has been observed in heat-treated microwires with a nanocrystalline structure.
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