X‐Ray Diffraction Contrast on Ferromagnetic Domain Walls in Fe‐Si Single Crystals

The contrast of ferromagnetic domains in (001) Fe‐3% Si single crystal plates is studied using X‐ray diffraction topography. This contrast is found to be due solely to the difference in deformation on opposite sides of the wall which is produced by magnetostriction. 180° walls are therefore never visible, whereas 90° walls show contrast if diffracting planes not belonging to the zone m 2 — m 2 are used ( m 1 and m 2 are unit vectors parallel to the magnetization on the two sides of the wall).