= Néel effect
{wiki=Néel_effect}
The Néel effect refers to the phenomenon observed in certain magnetic materials, particularly in antiferromagnets, where the application of an external magnetic field can cause a transition from an antiferromagnetic state to a state where the moments of neighboring magnetic ions are aligned parallel to each other, thus exhibiting ferromagnetic behavior. This effect is named after the French physicist Louis Néel, who made significant contributions to the understanding of magnetic materials and antiferromagnetism.
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