Samples of amorphous and nanocrystalline alloys were prepared by proper annealing of the metallic glasses: Fe_{73.5}Cu_{1}Nb_{3}Si_{13.5}B_{9} and Fe_{73.5}Cu_{1}Nb_{3}Si _{17.5}B_{5}. Magnetic hardening of the alloys at the onset of crystallization was studied by the two independent techniques, i.e. measurements of the magnetization hysteresis loops and Barkhausen effect. A good correlation between the coercivity and the maximum power of the Barkhausen noise has been found in these two compositions of the alloys.
Magnetic and magnetoelastic properties of the Fe_{73.5}Si_{16.5}B_{6}Cu_{1}Nb_{3} alloy change considerably during nanocrystallization process. Improvement of magnetic properties is accompanied by the decrease in piezomagnetic parameters such as magnetomechanical coupling and ΔE-effect.
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