Rare Earth Magnet Basics / Glossary of Magnet Terms / Demagnetization at high temperature
- Demagnetization at high temperature
- The phenomenon in which the magnetic flux decreases when a magnet magnetized at room temperature is exposed to high temperature caused by the shaking or flipping over of magnetic moments due to heat fluctuation is called demagnetization at high temperature. The demagnetization that occurs when the magnet is first raises to high temperature is called the initial demagnetization and the demagnetization that occurs over a certain period of time is called the change over time. Demagnetization for which the magnetic flux recovers when the magnet exposed to high temperature is returned to normal temperature is called reversible demagnetization. On the other hand, demagnetization for which the magnetic flux does not recover when the magnet is returned to normal temperature is called irreversible demagnetization. For details on the mechanisms behind these types of demagnetization, see "Magnet fundamentals" on our homepage.
