Anisotropic permeability in ultrasoft electroplated NiFeMo/Cu microwires: The Procopiu effect

The complex magnetoelastic behavior of electroplated NiFeMo/Cu microwires was analyzed by means of the magnetoimpedance and the Procopiu effects. Both phenomena are related through the circular magnetization generated by the ac and were modeled by assuming a magnetic domain and a magnetic relaxation model. From this analysis, information about the frequency and field dependencies of the circular and axial permeabilities was obtained. These results show that the magnetic anisotropy of Cu microwires galvanically coated with a NiFeMo film of 7 μ m in thickness is characterized by two circular permeability functions that are ascribed to different types of magnetic domains.