The Concept Of Motor Magnetic Tiles

Below the Curie temperature, ferromagnetic or ferrimagnetic materials contain numerous small regions with paired spontaneous magnetic moments. These regions are arranged in a disordered manner, and without an applied magnetic field, their overall magnetic moment is zero. These small regions are called magnetic tiles.

In ferromagnetic materials, strong exchange coupling exists between adjacent electrons. In the absence of an external magnetic field, their spin magnetic moments can spontaneously align within these tiny regions, forming small regions of spontaneous magnetization, called magnetic tiles. In unmagnetized ferromagnetic materials, although each tile has a distinct spontaneous magnetization direction and exhibits strong magnetic properties, the magnetization directions of many tiles vary, rendering the material as a whole non-magnetic.

When an electroferromagnetic material is exposed to an external magnetic field, the tiles whose spontaneous magnetization directions form a small angle with the external magnetic field expand in size as the applied magnetic field increases, further shifting their magnetization direction toward the external field.