= Einstein–de Haas effect
{wiki=Einstein–de_Haas_effect}
The Einstein-de Haas effect is a phenomenon observed in magnetism that demonstrates the relationship between the angular momentum of a spinning object and its magnetization. It was first described by Albert Einstein and Wander Johannes de Haas in 1915. When a ferromagnetic material is magnetized, the spins of the electrons in the material align, leading to a net magnetic moment. When this magnetized material is rotated or twisted, the alignment of the spins changes, resulting in a change in the magnetization.
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