The Curie-Weiss law describes the magnetic behavior of ferromagnetic materials above their Curie temperature, where they behave like paramagnets. This law states that the magnetic susceptibility (\(\chi\)) of a material is inversely proportional to the temperature (\(T\)) above the Curie temperature (\(T_C\)).
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The Curie–Weiss law approximates the magnetic susceptibility of interacting localized moments by in a suitable paramagnetic temperature range. A positive Weiss temperature often reflects predominantly ferromagnetic interactions, while a negative value often reflects antiferromagnetic interactions. It is not a universal exact law through an ordering transition, and crystal-field effects or itinerant carriers can require another description.