The Bloch wall reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Bloch wall

A Bloch wall is a narrow transition region at the boundary between domains, over which the magnetisation changes from its value in one domain to that in the next. If there are N steps in a Bloch wall, then over each step the direction of the magnetisation changes by π/N radians.

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