Curie Temperature Estimate Calculator

Predict transition points for ferromagnets from parameters. Fit Curie–Weiss data or mean field estimates. Download tables, share reports, and refine your model today.

Use exchange parameters for theoretical estimates, or susceptibility data for experimental fits.
Nearest-neighbor count in the lattice.
Examples: 1/2, 1, 3/2, 2.
Strength of neighbor coupling.
Choose energy in meV or its Kelvin equivalent.
Model note
This mean-field estimate captures trends but can overpredict Tc. Real materials depend on anisotropy, dimensionality, and longer-range interactions.
Often near Tc for ferromagnets.
Interpretation
In Curie–Weiss behavior, positive θ suggests dominant ferromagnetic interactions. This estimate assumes Tc ≈ θ, which is an approximation.
The fit uses 1/χ vs T. Any consistent χ units are acceptable.
What the fit returns
  • θ (K): used as Tc estimate.
  • C: Curie constant (in your χ units).
  • R²: goodness of the linear fit.
Best practice: use the paramagnetic region, above Tc.
Result appears above after submission.

Formula used

This tool offers exchange-based and Curie–Weiss-based Curie temperature estimates.
1) Mean-field Heisenberg estimate
The mean-field relation is: kBTc = (2/3) z J S(S+1). If J is entered in meV, it is converted to Joules.
2) Curie–Weiss estimate
Curie–Weiss behavior follows: χ = C / (T − θ). Rearranging gives 1/χ = (1/C)T − θ/C. A linear fit of 1/χ vs T yields θ, used here as Tc.
Practical note
Tc can differ from θ due to critical fluctuations and material specifics. Use these estimates for screening and comparison, then validate experimentally.

How to use this calculator

  1. Select an estimation method that matches your data source.
  2. For mean-field, enter z, S, and exchange parameter J with units.
  3. For θ-direct, enter your Weiss temperature from a fit.
  4. For data fitting, paste T and χ rows from the paramagnetic region.
  5. Submit to compute Tc, then export details as CSV or PDF.

Example data table

Reference Curie temperatures vary with purity and structure.
Material Approx. Tc (K) Notes
Iron (Fe)1043Room-temperature ferromagnet.
Nickel (Ni)627Common magnetic alloy component.
Cobalt (Co)1388High Tc transition metal.
Gadolinium (Gd)293Near room temperature ordering.
Magnetite (Fe₃O₄)858Ferrimagnetic oxide, geophysics use.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.