Curie Law and Curie Temperature:
The magnetic susceptibility of a paramagnetic material varies inversely as the absolute temperature,
where, C is a constant called the Curie constant and this equation is known as Curie’s law.
The susceptibility of ferromagnetic material decreases with temperature in accordance with Curie-Weiss law.
Xm = \(\frac{C}{T-T_{C}}\) ……………… (1)
here, TC is Curie temperature of Ferromagnetic substances.
Curie Temperature : The temperature of transition from ferromagnetism to paramagnetism is called the Curie temperature TC. Table 1 lists the Curie temperatures of certain ferromagnets. The susceptibility above the Curie temperature i.e., in the paramagnetic phase is described by
X = \(\frac{C}{T-T_{C}}\) (T > TC)
Table 1: Curie Temperature Tc of some Ferromagnetic Materials
| Material |
Tr (K) |
| Cobalt |
1394 |
| Iron |
1043 |
| Nickel |
631 |
| Gadolinium |
317 |
