Advanced Magnetic Microwires for Sensing Applications

Several routes allowing the development of low cost magnetic microwires coated by flexible, insulating and biocompatible glass-
coating with tunable magnetic properties are overviewed. Amorphous microwires present excellent soft magnetic properties and the

giant magnetoimpedance (GMI) effect. The GMI effect, obtained even in as-prepared Co-rich microwires, can be further improved by
appropriate annealing (including conventional annealing, stress-annealing, and Joule heating). While as-prepared Fe-rich microwires
often exhibit low GMI effect, magnetic softening and GMI effect improvement can be achieved in Finemet-type microwires upon
nanocrystallization. Stress-annealing and combined stress-annealed followed by conventional annealing also yield remarkable (more
than an order of magnitude) GMI improvement in amorphous Fe-rich microwires.