Английская Википедия:Barnett effect

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Шаблон: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 Шаблон:Math tends to spontaneously magnetize, with a magnetization given by

<math>M = \chi \omega / \gamma, </math>

where Шаблон:Math is the gyromagnetic ratio for the material, Шаблон:Math 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

Шаблон:Reflist

Further reading


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