Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond curie temperature, then it will show

Options

A. paramagnetism
B. anti-ferromagnetism
C. no magnetic property
D. diamagnetism

Answer

A

Explanation

If the temperature of a ferromagnetic material is raised above a certain critical value , called the Curie temperature , the exchange coupling ceases to be effective . Most of such materials become simply paramagnetic , i.e. the dipoles still tend to align with an external field but much more weakly and thermal agitation can now more easily disrupt the alignment .