Electromagnetism by Hiqmet Kamberaj

Author:Hiqmet Kamberaj
Language: eng
Format: epub
ISBN: 9783030967802
Publisher: Springer International Publishing

(8.35)

Equation (8.51) is known as Curie’s law, and the constant C is called Curie’s constant. The law implies that when , the magnetization is zero, corresponding to a random orientation of magnetic moments. With increasing the ratio of the magnetic field to temperature, the magnetization approaches a maximum value, which corresponds to the complete alignment of its moments, and Eq. (8.51) becomes invalid.

When the temperature of a ferromagnetic substance is greater or equal to the critical Curie temperature, , the substance loses its residual magnetization and becomes paramagnetic. Below , the magnetic moments are aligned and the substance is ferromagnetic. For , the thermal fluctuations are high such that they cause a random orientation of the magnetic moments, and the substance becomes paramagnetic, as shown in Fig. 8.6.

Fig. 8.6Magnetization versus temperature for a ferromagnetic and paramagnetic

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.