A Néel wall is a narrow transition region between magnetic domains. In the Neel wall, the magnetisation rotates from the direction of the first domain to the direction of the second, with a rotation axis that is parallel to the wall plane. It consists of a core with fast varying rotation and two tails where the rotation logarithmically decays. Néel walls are the common magnetic domain wall type in very thin film where the exchange length is very large compared to the thickness. Néel walls would spread across the whole volume if it weren't for magnetic anisotropy

Magnetic anisotropy

Magnetic anisotropy is the direction dependence of a material's magnetic properties. In the absence of an applied magnetic field, a magnetically isotropic material has no preferential direction for its magnetic moment while a magnetically anisotropic material will align its moment with one of the...

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Néel walls are named after the French physicist Louis Néel.

Another type of transition region is the Bloch wall

Bloch wall

A Bloch wall is a narrow transition region at the boundary between magnetic domains, over which the magnetization changes from its value in one domain to that in the next. The magnetization rotates along an axis that is perpendicular to the plane of the wall unlike the Néel wall where the...

were the magnetisation rotates along an axis that is perpendicular to the plane of the wall. Bloch walls are more common in thicker materials.