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What are ferromagnetic materials ? Give ...

What are ferromagnetic materials ? Give examples. What happens to a ferromagnetic material at curie temperature ?

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Ferro magnetic substances : (a) These are strongly attracted by magnet. (b) Susceptibility is large. Positive and temperature dependent. (c) Relative permeability, `mu_(r) gt gt 1` (d) Atoms have permanent dipole moments which are organised in domains. Ex : Iron, Cobalt, Nickel
Curie temperature : The temperature above which a ferro magnetic substance changes in to para magnetic substance changes in to para magnetic substance is called curie temperature.
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