Barnett effect
Template:Short description The Barnett effect is the magnetization of an uncharged body when spun on its axis.[1] It was discovered by American physicist Samuel Barnett in 1915.[2]
An uncharged object rotating with angular velocity ωScript error: No such module "Check for unknown parameters". tends to spontaneously magnetize, with a magnetization given by
where γScript error: No such module "Check for unknown parameters". is the gyromagnetic ratio for the material, χScript error: No such module "Check for unknown parameters". is the magnetic susceptibility.
The magnetization occurs parallel to the axis of spin. Barnett was motivated by a prediction by Owen Richardson in 1908, later named the Einstein–de Haas effect, that magnetizing a ferromagnet can induce a mechanical rotation. He instead looked for the opposite effect, that is, that spinning a ferromagnet could change its magnetization. He established the effect with a long series of experiments between 1908 and 1915.
See also
References
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Further reading
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