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Q. Curie-Weiss law is obeyed by iron

Punjab PMETPunjab PMET 2007Magnetism and Matter

Solution:

Iron is a ferromagnetic substance. The Curie point for iron is $1043\, K \left(=770^{\circ} C \right)$. 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 such materials then become paramagnetic. Also after Curie point, susceptibility of a ferromagnetic substance varies inversely with its absolute temperature. Hence, a ferromagnetic substance obeys Curie-Weiss law above its Curie temperature.