Curie–Weiss law

In magnetism, the Curie–Weiss law describes the magnetic susceptibility $χ$ of a ferromagnet in the paramagnetic region above the Curie temperature:

\chi ={\frac {C}{T-T_{\rm {C}}}}

where $C$ is a material-specific Curie constant, $T$ is the absolute temperature, and $T C$ is the Curie temperature, both measured in kelvin. The law predicts a singularity in the susceptibility at $T = T C$ . Below this temperature, the ferromagnet has a spontaneous magnetization. The name is given after Pierre Curie and Pierre Weiss.

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