Dynamic magnetic studies using impedance spectra

In this work., a method to study the dynamic properties of magnetic materia ls through the impedance spectra is presented. Fittings of the mu vs. f cur ves extracted from the impedance spectra were made. In this way, we are abl e to obtain the main quantities describing the dynamic properties of a magn etic material, namely the domain wall and rotation contributions to the ove rall permeability, as well as the relaxation frequencies associated with th e wall motion. The method was applied to samples of (110)[001]FeSi3%, with different angles between the easy axis and the magnetization direction. The well-known details of the domain structure evolution of this material were used to interpret the mu x f x H-DC curves. (C) 2001 Elsevier Science B.V. All rights reserved.