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  4. At what temperature iron becomes paramagnetic?

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Q. At what temperature iron becomes paramagnetic?

Delhi UMET/DPMTDelhi UMET/DPMT 2008Magnetism and Matter

Solution:

When a ferromagnetic material is heated above a certain temperature (called Curie temperature), the exchange coupling suddenly disappears.
The substance, therefore starts behaving as paramagnetic.
Curie temperature for iron is about $800\,K$.
Note For cobalt, it is $1375\, K$ and for nickel, the curie temperature is $625\, K$.