Influence of thermal treatment on the magnetic properties of Co- and Fe-based amorphous alloys

Correlation of magnetic domains, microstructure and GMI effect of Joule-annealed melt-extracted Co68.15 Fe4.35 Si12.25 B13.75 Nb1 Cu0.5 microwires for double functional sensors

“…These local order averaged gain-size of 5 nm nanocrystalline phase corresponds to the largest obtained magneto-impedance response. Possible reasons for nanocrystalline improved GMI effect are: (i) enhancement of soft magnetic properties due to negligible magnetocrystalline anisotropy for the gain size smaller than the exchange interaction length and favoured formation of induced anisotropies after annealing [31,32], (ii) increasing permeability in concomitance with small sized nanocrystalline phase and stabilized domain structure [33,34], (iii) nanocrystalline phase embedded in amorphous matrix decreasing electrical resistivity and increasing large saturation magnetization, leading to better soft magnetic properties. However, the decrease of GMI ratio for sample of 100 mA is likely due to the decrease of circular magnetic anisotropy in Fig.…”

Influence of Cr on some structural and magnetic properties of amorphous Co-based alloys

“…Amorphous Co-and Fe-based alloys with chromium prepared by rapid quenching technique have good magnetic properties [1]. On the other hand, the result of the preparation is a thermodynamically unstable structure, which tends to relax to energetically more favourable state.…”