Antiferromagnetism

The antiferromagnetism (griech.: anti approximately; lat.: ferrum iron; of griech.: magnetis (lithos) stone from Magnesien) is a cooperative, magnetic phenomenon, which and. A. by Louis Néel one examined in detail.

With this effectthe spins of the atoms with a constant angle of rotation different of zero are to each other aligned and compensate themselves accurately over the entire crystal. In the simplest case this angle of rotation is 180°, so that the spins of neighbouring atoms stand antiparallelly to each other.

With the more well-known ferromagnetism the spins are parallelto each other aligned, whereby a permamentes macroscopic magnetic field is developed. Below the Néel temperature in such a way specified the permeability is nearly temperature independent with the antiferromagnetism. Above this temperature is the behavior of the body paramagnetic.

The training of the antiferromagnetic order leaves itself exactly as with other cooperative magneticExplain to phenomena by the exchange reciprocal effect.

See also: magnetic order, ferromagnetism, spin density wave, ferric magnetism