At what temperature does a magnet lose its magnetic power and why?
For each material of magnet, there is a Curie temperature, or temperature at which the heat will destroy the polarization of the material, causing it to loses its magnetic properties. These former magnets can be re-magnetized in the same way the alloys are magnetized for the first time. Temperatures lower than the Curie temperature can weaken a magnet, but the magnetism will usually return to full strength when it is returned to normal temperatures. In the case of rocks and minerals, remanent magnetism appears below the Curie point—about 570° C (1,060° F) for the common magnetic mineral magnetite.
Effects Of Temperature On Magnets
