When heated above 176° Fahrenheit (80° Celsius), magnets will quickly lose their magnetic properties. The magnet will become permanently demagnetized if exposed to these temperatures for a certain length of time or heated at a significantly higher temperature (Curie temperature).

At what temperature do magnets demagnetize?

If a magnet is exposed to high temperatures, the delicate balance between temperature and magnetic domains is destabilized. At around 80 °C, a magnet will lose its magnetism and it will become demagnetized permanently if exposed to this temperature for a period, or if heated above their Curie temperature.

Does heat demagnetize?

Like the strength of the magnet, heat affects the magnets in terms of resistance to demagnetization, which generally decreases with increasing temperature. The only exception are ceramic (ferrite) magnets, which are easier to demagnetize at low temperature and more difficult to demagnetize at high temperature.