Shin-Etsu Rare Earth Magnets

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Demagnetizing field

A magnetic field generated in a permanent magnet in the opposite direction of its magnetization. This is also called a demagnetizing field. The size of a demagnetizing field is proportional to the size of the magnetization and this proportionality coefficient is called the demagnetizing field coefficient. Like the permeance coefficient, the demagnetizing field coefficient is determined only by the shape of the magnet. With the magnetic field as positive, the larger the permeance coefficient, the smaller the demagnetizing field coefficient. Looking at the magnet shape, the more a magnet is shaped long and fine in the magnetization direction moving the magnetic poles farther from each other, the smaller the demagnetization coefficient.

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Glossary list