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Why does paramagnetism become stronger at lower temperatures?

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Learn about magnetic fields and the levels of particles, atoms, crystals, and domains — magnet Magnetic fields and the levels of magnetism of particles, atoms, crystals, and domains.

Paramagnetism becomes stronger at lower temperatures because thermal energy, which promotes random motion, is reduced, allowing the atomic magnetic dipoles to align more easily with an applied magnetic field.12

In many paramagnetic substances, the individual atoms or molecules possess a permanent magnetic dipole moment. At higher temperatures, the greater random thermal motion of these atoms disrupts their alignment, effectively weakening the material's magnetic response. As the temperature decreases, this de-aligning thermal agitation diminishes, enabling the dipoles to align more effectively with the external field.12

This relationship is described by Curie's law, which states that the magnetic susceptibility of many paramagnetic substances is inversely proportional to the absolute temperature. While this relationship holds for many compounds, it is important to note that in some materials, such as certain metals, paramagnetic susceptibility remains independent of temperature because the magnetic behavior is governed by conduction electrons rather than permanent atomic dipoles.3412