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# Curie constant

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 kB 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).
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