Abstract
The GMI effect was investigated in microwires based on a Fe70Si18B9Cu1Nb2 alloy (ρ = d/D = 0.5, d = 15 µm) after heat treatment at 550 °C resulting in the formation of a non-uniform nanocrystalline structure. It was shown experimentally that short heat treatments (≤2 min 40 s) led to the emergence of α-Fe(Si) nanocrystals near the surface of a microwire while the central part of the microwire remained amorphous. Simultaneous processes of stress relaxation and formation of the nanocrystalline structure induced an enhancement of the GMI effect. A maximum value of ΔZ/Z = 150 % was observed at a frequency of 200 MHz. With an increase in the heat treatment time, the soft magnetic properties of the surface layer degenerated, resulting in the degradation of the observed GMI effect.
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