What happens to a ferromagnetic material when its temperature increases above curie temperature?
The ferromagnetic substances are those types of substances in which the strong magnetism is applied in the direction of the magnetic field. At a certain critical temperature, the magnetism is lost. Above curie temperature, a substance loses its magnetic properties.
Hence, when a ferromagnetic substance heated above curie temperature, its ferromagnetic properties get lost and it converts to paramagnetic substances.