How this calculator works
For an ideal paramagnet in weak applied field, thermal disorder opposes dipole alignment and volume susceptibility varies as C/T. Here M and H both use A/m, so susceptibility is dimensionless and C has units K. A formula written with magnetic flux density B in teslas uses a differently scaled constant; do not insert B into the H field. Saturation and interacting magnetic moments require a more complete model.
Formula
chi = M/H = C/T; M = CH/T. In a weakly magnetic medium B is approximately mu0 H.
Worked example
With C = 1 K, H = 1000 A/m and T = 250 K, M = 4 A/m and chi = 0.004. Doubling temperature to 500 K halves M to 2 A/m.
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Frequently asked questions
Is this the Curie-Weiss law?
No. Curie-Weiss replaces T with T minus a material interaction temperature.
Can field be signed?
Yes. A positive Curie constant gives magnetization with the same sign as the applied field.
Where does the approximation fail?
At strong field, low temperature, magnetic ordering or saturation, the simple inverse-temperature law can fail.