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Curie temperature is the temperature above which -
A
paramagnetic material becomes ferromagnetic material
B
ferromagnetic material becomes diamagnetic material
C
ferromagnetic material becomes paramagnetic material
D
paramagnetic material becomes diamagnetic material
Detailed Solution
In a ferromagnetic material the atomic magnetic moments are aligned parallel to each other inside small regions called domains.
When the material is heated, thermal agitation increases and starts disturbing this alignment.
Above a certain temperature, called the Curie temperature $T_C$, the domain structure is destroyed completely.
The material then behaves like a paramagnetic substance, with susceptibility $\chi = \dfrac{C}{T - T_C}$ (Curie-Weiss law).
So the Curie temperature is the temperature above which a ferromagnetic material becomes a paramagnetic material.
When the material is heated, thermal agitation increases and starts disturbing this alignment.
Above a certain temperature, called the Curie temperature $T_C$, the domain structure is destroyed completely.
The material then behaves like a paramagnetic substance, with susceptibility $\chi = \dfrac{C}{T - T_C}$ (Curie-Weiss law).
So the Curie temperature is the temperature above which a ferromagnetic material becomes a paramagnetic material.