Structure, Magnetic Properties, and Magnetoimpedance of the Fe73.5−xCrxSi13.5B9Nb3Cu1 (x = 0 to 5) Alloys

Structure, magnetic properties, and magnetoimpedance (MI) of the nanocrystalline Fe
_73.5−x
Cr
_x
Si
_13.5
B
₉
Nb
₃
Cu
₁
(
x
= 0%, 1%, 2%, 3%, and 5%) ribbons produced by rapid quenching after thermal annealing at 520 °C for 2 h were investigated with the aim to produce materials with different functional possibilities. It was shown that increasing the Cr content to 5% leads to a large increase of the coercivity of the samples due to phases Fe
₂
B and Cr appearing together with a drastic increase of the surface roughness. The possibility of determination of volume of these non-homogeneous was presented by a method based on MI effect. It was shown that the addition of Cr not only increased the MI effect, but also the peak of MI is shifted to the higher fields. It can be used for magnetic field sensors in certain ranges of magnetic fields.