🧲 Curie Constant Calculator
Enter the number density of magnetic ions and their effective magnetic moment to calculate the Curie constant used in Curie’s law of paramagnetic susceptibility.
What is the Curie constant?
The Curie constant appears in Curie’s law, which describes how the magnetic susceptibility of a paramagnetic material varies with temperature: χ = C ÷ T. It captures how strongly a material’s atomic magnetic moments respond to a field once thermal agitation is accounted for.
The formula
In SI units, the Curie constant is C = (μ0 × N × peff2 × μB2) ÷ (3kB), where N is the number density of magnetic ions, peff is the effective magnetic moment in Bohr magnetons, μB is the Bohr magneton, and kB is Boltzmann’s constant.
Curie’s law applies to non-interacting magnetic moments at temperatures well above any magnetic ordering transition; materials that order magnetically (ferromagnets, antiferromagnets) instead follow the Curie-Weiss law near their transition temperature. This calculator is for general physics and materials science education.