Influences of axial field upon circular magnetization and eddy‐current anomaly factor in Fe‐based nanocrystalline wire

Fe‐based soft magnetic wire with transverse magnetic anisotropy was obtained by stress current annealing. Its circular permeability, µ  =  µ ′ – j µ ″, has been determined from the measurements of impedance, Z  =  R  + j ωL , as a function of frequency ( f  = 10 – 10 5  Hz), AC current amplitude ( I  = 0.1 – 100 mA) and DC bias field ( H  = 0 – 5.4 kA/m). An experimental study of the influence of H upon the circular magnetization and the f‐dependent µ  =  µ ′ – j µ ″ has been performed. It is concluded that the axial field, H , evolution of the circular permeability, µ  =  µ ′ – j µ ″, the relaxation frequency, f τ , and the eddy‐current anomaly factor, η , can be explained in terms of the modification of domain structure by the applied axial field H .