Shin-Etsu Rare Earth Magnets

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Exchange spring magnets

This is a new type of magnet comprising a fine sub-micron hard magnetic phase and soft magnetic phase that behaves like a homogenous and uniform magnet with magnetic exchange coupling operation working between the two phases. Because its magnetization behavior is as though the hard magnetic phase and soft magnetic phase are linked with a magnetic spring, this kind of magnet is called an exchange spring magnet. In the second quadrant of the magnetization curve, these magnets have a strong magnetization recovery capacity not found in normal magnets. They have a comparatively high magnetization, but the history curve square type is poor and the coercive force is small. It is said that if a high- coercivity exchange spring magnet with anisotropy could be developed, it would be the best magnet in the world, but this goal has not been attained at this time. Since the magnet organization above is a nano-scale complex organization, these magnets are also called nano-composite magnets.

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Glossary list