Curies Law Calculator
Calculate magnetic susceptibility using Curie's law at temperature
What Is Curie's Law?
Curie's law describes how magnetic susceptibility of a paramagnetic material varies inversely with absolute temperature. As temperature increases, thermal agitation reduces the net alignment of magnetic moments in an applied field.
Curie's Law Formula
$$\chi = \frac{C}{T}$$\(\chi\) is magnetic susceptibility (dimensionless), \(C\) is the Curie constant (K), and \(T\) is absolute temperature (K). Doubling the temperature halves the susceptibility.
Example: with \(C = 0.3\) K at \(T = 300\) K, susceptibility is \(\chi = 0.3 / 300 = 0.001\).
Applications in Magnetism
Curie's law helps characterize paramagnetic salts, estimate Curie constants from susceptibility measurements at different temperatures, and distinguish paramagnetic from ferromagnetic behavior.
Frequently Asked Questions
What is magnetic susceptibility?
Susceptibility χ measures how easily a material magnetizes in an applied field. Paramagnetic materials have small positive χ that decreases with temperature.
How do I find the Curie constant from data?
Plot χ versus 1/T; the slope gives C. Or use this calculator: enter χ and T with "Find Curie constant (C)" selected.
Does Curie's law work below the Curie temperature?
No. Below the Curie temperature, ferromagnetic ordering dominates and the simple χ = C/T relation no longer holds.
Can I solve for temperature?
Yes. Rearranging gives T = C/χ. Select "Find temperature (T)" and enter C and χ.
Why use kelvin for temperature?
Curie's law is defined on the absolute temperature scale. Always convert Celsius to kelvin by adding 273.15 before calculating.
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