Question

What happens when a ferromagnetic substance is heated to a high temperature?

Answer 1

1. When magnets are heated at high temperatures, they lose their permanent magnetic properties and are replaced by induced magnetism. Such temperature is called Curie Temperature.
2. Thus, magnetism works below Curie temperature.
3. Paramagnetic substances are weakly attracted by the magnetic field. They generally lose their magnetism when applied in the external field. They cannot be used in making permanent magnets. For example - Aluminium (Al), Manganese (Mn), Chromium (Cr), etc.
4. Ferromagnetic substances are strongly attracted by the magnetic field. They generally retain their magnetism on the removal of the external field. They are used in making permanent magnets. For example - Iron (Fe), Nickel (Ni), Cobalt (Co), and their alloys.
5. Thus, when ferromagnetic substances are heated at high temperatures, they lose their ferromagnetism and become paramagnetic in nature.
6. It happens due to the disorderness in the electronic arrangement.