Curie-Weiss Law
A thermodynamic law describing the magnetic susceptibility of a ferromagnetic or antiferromagnetic material in its paramagnetic phase above the Curie temperature T_C.
Governing formula
χ_m = C / (T - T_C) (for T > T_C)
SI unit
Dimensionless (Magnetic Susceptibility)
In depth
Above the Curie temperature T_C, thermal agitation overcomes spontaneous domain alignment. As temperature decreases toward T_C, magnetic susceptibility χ_m diverges toward infinity.
Examples in the real world
Measuring paramagnetic susceptibility divergence in iron above its 1043 K (770 °C) Curie temperature.