THEORETICAL EDDY-CURRENT PERMEABILITY SPECTRA OF SLABS WITH BAR DOMAINS

A systematic description of theoretical eddy-current permeability spec tra of infinitely long and wide slabs with 180 degrees bar domains is made for the classical model, the Pry-Bean and Polivanov model concern ing the eddy-current anomaly owing to domain wall displacements (DWD), as well as a model dealing with the anomalous low-frequency eddy-curr ent losses owing to domain magnetization rotations (DMR), A general ca se including both DWD and DMR is treated based on these models, Analyt ic formulas are given accompanied by numerical computations. The model results can be directly used in many practical cases, They also provi de much information on the nature of eddy-current Losses, To explain t hese, extensive discussions are made, in which concepts such as the eq uivalent circuit, the classical, localized, and lateral eddy currents, the separate and superimposed eddy currents, and the skin effect are clarified.