Curie constant

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Curie's constant is

$C = \frac{N \mu^2}{k_B}$ ,

where $N$ is the number of magnetic moments, $μ$ is an individual magnetic moment and $k B$ is Boltzmann's constant. It comes from Curie's Law, which is the relationship between magnetic susceptibility and temperature of a paramagnetic material

$\chi = \frac{C}{T}$ .

This equation was first derived by Pierre Curie (Marie Curie's husband.)

Because of the relationship between magnetic susceptibility $χ$ , magnetization $M$ and applied magnetic field $H$ :

$\chi = \frac{M}{H}$ ,

this shows that for a paramagnetic system of non-interacting magnetic moments, magnetization $M$ is inversely related to temperature $T$ (see Curie's Law).