Electrical Engineering ⇒ Topic : Curie temperature

Curie temperature. The magnetisation of a magnetised substance decreases with the increase in temperature. It is because when a magnetised substance is heated, random thermal motions tend to destroy the alignment of molecular magnets. As a results, the magnetisation of the substance decreases. At sufficiently high temperature, the magnetic property of the substance suddenly disappears and the substance loses magnetism.

The temperature at which a magnetised substance loses its magnetism is called Curie temperature or Curie point of the substance.

For example, the curie temperature of iron is 770°C. Therefore, if the temperature of the magnetised iron piece becomes 770°C, it will loose its magnetism. Similarly, the curie temperatures of nickel and cobalt are 358°C and 1121°C respectively.