Domain wall (magnetism)
（重定向自Bloch wall）
![Domain wall (B) with gradual re-orientation of the magnetic moments between two 180-degree domains (A) and (C) (Presented is a Bloch wall, and not a Néel one, see below)](/Images/godic/202501/01/Domain_wall_vectors.svg4846.png")
![Schematic representation of domain wall unpinning](/Images/godic/202501/01/Barkhausensprung4846.gif")
A domain wall is a term used in physics which can have similar meanings in magnetism, optics, or string theory. These phenomena can all be generically described as topological solitons which occur whenever a discrete symmetry is spontaneously broken.