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The Curie-Weiss law describes the magnetic susceptibility of a ferromagnet in the paramagnetic region above the Curie point:## See also

## References

Introduction to Solid State Physics 7th ed. (1996) by Charles Kittel

- $$

where

- $chi$ is the magnetic susceptibility

- C is a material-specific Curie constant

- T is absolute temperature, measured in kelvins

- T
_{c}is the Curie temperature, measured in kelvins

The susceptibility has a singularity at T = T_{c}. At this temperature and below there exists a spontaneous magnetization.

In many materials the Curie-Weiss law fails to describe the susceptibility in the immediate vicinity of the Curie point, since it is based on a mean-field approximation. Instead, there is a critical behavior of the form

- $$

with the critical exponent $gamma,$. However, at temperatures $T\; gg\; T\_c$ the expression of the Curie-Weiss law still holds, but with $T\_c,$ representing a temperature which is somewhat higher than the actual Curie temperature.

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Last updated on Wednesday February 27, 2008 at 02:46:47 PST (GMT -0800)

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This article is licensed under the GNU Free Documentation License.

Last updated on Wednesday February 27, 2008 at 02:46:47 PST (GMT -0800)

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