where

$chi$ is the magnetic susceptibility

C is a material-specific Curie constant

T is absolute temperature, measured in kelvins

T_c is the Curie temperature, measured in kelvins

The susceptibility has a singularity at T = T_c. At this temperature and below there exists a spontaneous magnetization.

In many materials the Curie-Weiss law fails to describe the susceptibility in the immediate vicinity of the Curie point, since it is based on a mean-field approximation. Instead, there is a critical behavior of the form

with the critical exponent $gamma,$. However, at temperatures $T\; gg\; T\_c$ the expression of the Curie-Weiss law still holds, but with $T\_c,$ representing a temperature which is somewhat higher than the actual Curie temperature.

See also

• Curie's law
• Paramagnetism
• Pierre Curie

References