Depinning of a domain wall

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In magnetic materials, a region of homogenous magnetic orientation is called a "domain" and the interface between two such regions is called a "domain wall". A domain wall is said to be "pinned" if it is fixed by an external magnetic field (often created by nearby, strongly magnetized domain). "Depinning of a domain wall" refers to the unfixing of the domain wall by either removing the external field or, more often, reversing its polarity (since the opposite polarity may not have as strong of an influence).