Barnett effect
The Barnett effect is the magnetization of an uncharged body when spun on its axis.[1]
An uncharged object rotating with angular velocity ω tends to spontaneously magnetize, with a magnetization given by:
with γ = gyromagnetic ratio for the material, χ = magnetic susceptibility.
The magnetization occurs parallel to the axis of spin. It was first reported by S. J. Barnett in 1915. Barnett was motivated by the report of the Einstein-de Haas effect, which describes magnetizing a ferromagnet can induce a mechanical rotation. He instead looked for the opposite effect, that is, a spinning ferromaget changing its magnetization.
In-line references and notes
- ^
Bruce T. Draine (2003). "§7.3 Barnett effect". In Andrew W. Blain, F. Combes, Bruce T. Draine, D. Pfenniger, Yves Revaz (ed.). The Cold Universe. Springer. p. 276. ISBN 354040838X.
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Further reading
- S. J. Barnett, Magnetization by Rotation, Physical Review, Vol. 6, Issue 4, pp. 239–270 (1915). [1]
- S. J. Barnett, Gyromagnetic and Electron-Inertia Effects, Review of Modern Physics, Vol. 7, Issue 2, pp. 129-166 (1935). [2]
See also
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