The exact temperature at which a magnet demagnetizes can vary depending on the type of magnet and its composition. In general, exposure to temperatures above the Curie temperature of the magnet material can cause it to lose its magnetic properties. For common materials like neodymium magnets, the Curie temperature is around 310-400 degrees Celsius.

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Curie point is the temperature above which a ferromagnetic substance behaves as a paramagnetic substance.

The Curie temperature of copper sulfide is approximately 32°C, above which it loses its ferromagnetic properties.

Curie temperature