Domain wall

Stan Zurek, Domain wall, Encyclopedia Magnetica,
https://e-magnetica.pl/doku.php/domain_wall

Domain wall - a narrow region (around 100-200 atoms thick) separating magnetic domains.

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Magnetic domains in a single grain (outlined with a black line) of non-oriented electrical steel. The photo shows an area 0.1 mm wide, and the arrows show orientation of the domains. The domains are separated by domain walls.

^{S. Zurek, E-Magnetica.pl, CC-BY-4.0}

Magnetic domain structure (lancet combs switching during magnetisation) in high-permeability grain-oriented electrical steel. Bar domains are visible in the upper part.