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Domain wall (magnetism)
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<p>In <a href="/facts/Magnetism/eo75vApl">magnetism</a>, a domain wall is an interface separating <a href="/facts/Magnetic_domain/f7KTN10R">magnetic domains</a>. It is a transition between different magnetic <a href="/facts/Moment_(physics)/WvgxtdhP">moments</a> and usually undergoes an <a href="/facts/Angular_displacement/qoqvM9Np">angular displacement</a> of 90° or 180°. A domain wall is a gradual reorientation of individual moments across a finite distance. The domain wall thickness depends on the anisotropy of the material, but on average spans across around 100–150 atoms. </p>