Magnetic Domain Walls in Zone Melted Iron Crystals as Observed by X-Ray Diffraction Topography

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Abstract
Thin iron crystals having the (001) plane parallel to their surfaces are prepared from zone melted iron, and 90° magnetic domain walls and black-white images appearing at the junctions of {110} 90° walls are examined by transmission X-ray topography. The topographs are taken with various reflections. The displacement of lattice points in the neighbourhood of a {110} 90° wall is in the planes parallel to the wall plane. Black-white images are formed by axially symmetrical strain fields around the junctions of {110} 90° walls. Long straight images lying in the directions in the crystal surfaces and short images in rows in the directions are found. These images are due to the strain fields around the junctions, having the directions, in the interior of the crystals. The strain fields giving rise to the black-white images are discussed in terms of the dynamical theory of diffraction contrast in deformed crystals.