Bloch wall
Encyclopedia
Magnetization
In classical electromagnetism, magnetization or magnetic polarization is the vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material...
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 (see image) unlike the Néel wall
Néel wall
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...
where the rotation axis is parallel to the plane of the wall. An example of a Néel wall transition is shown in the animation below.
Bloch walls are named after the physicist Felix Bloch
Felix Bloch
Felix Bloch was a Swiss physicist, working mainly in the U.S.-Life and work:Bloch was born in Zürich, Switzerland to Jewish parents Gustav and Agnes Bloch. He was educated there and at the Eidgenössische Technische Hochschule, also in Zürich. Initially studying engineering he soon changed to physics...
.
Bloch domain walls appear in bulk materials, i.e. when sizes of magnetic material are considerably larger than domain wall width (according to the width definition of Lilley ). In this case energy of the demagnetization field does not impact the micromagnetic structure of wall. The mixed cases are possible as well when demagnetization field changes the magnetic domains (magnetization
Magnetization
In classical electromagnetism, magnetization or magnetic polarization is the vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material...
direction in domains) but not the domain walls.