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Abstract
Domain walls in barium hexaferrite (BaFe12O19) and SmCo5 are shown to form a lattice. Defects observed in the Boch wall patterns are interpreted geometrically as dislocations and disclinations. The elastic properties of these defects are briefly discussed. The faceted appearance of some Bloch wall patterns is analyzed on the basis of a surface energy torque term arising from an anisotropy in the Bloch wall energy. The anisotropy is deduced to arise from high-order coefficients in the anisotropy energy and the magnetostriction.
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