Abstract
DC-biased magnetic properties of Fe-3 mass % Si powder cores were investigated using a nonmagnetic grain boundary (NMGB) model. The powder was prepared by gas atomization. DC initial BH loops were measured and differential permeability was calculated at each magnetic force H. The values were compared with the NMGB-model considered from particle size distribution, body-centered cubic lattice situation and gap width distribution. The calculated values were in good agreement with measured values, which had intrinsic permeability: 3000, aspect ratio: 1.0 and geometric mean gap width: 0.41 μm. The relative inaccuracy of differential permeability was from -5.5 to 5.3 % between H=0.6 and 16 k A/m.
