The origin and peculiarities of the spatial distribution of the magnetostatic fields H m near the planar grain boundaries (GB) oriented perpendicular to the rolling direction (RD) in grain-oriented silicon steel (GOSS) sheets, which are magnetized along the RD to induction above 1.0 T, are investigated. It was found experimentally that there are perturbations δ M of the net magnetization M in grains near the planar GB even at inductions close to saturation B s . Such perturbations exclude ruptures of the net magnetization normal component M n and the appearance of magnetic charges (σ m = µ 0 M n = 0) on the GB surfaces. The calculation of the field H m components related to the planar GB was carried out with our assumptions that net magnetization inhomogeneities (the volume magnetic charges ρ m = −µ 0 div M) in grains are the sources of this field. The results of the computation are in good agreement with the results of the field H m component measurements for the samples of GOSS. Some regularities of magnetic interaction between neighbouring grains in GOSS sheets are discussed.

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