A low-noise ferrite magnetic shield

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dc.creatorKornack, T. W.
dc.creatorSmullin, S. J.
dc.creatorLee, S. -K.
dc.creatorRomalis, M. V.
dc.date2007-03-11
dc.date2007-07-26
dc.date.accessioned2026-07-07T08:20:20Z
dc.date.available2026-07-07T08:20:20Z
dc.descriptionFerrite materials provide magnetic shielding performance similar to commonly used high permeability metals but have lower intrinsic magnetic noise generated by thermal Johnson currents due to their high electrical resistivity. Measurements inside a ferrite shield with a spin-exchange relaxation-free atomic magnetometer reveal a noise level of 0.75 fT Hz^(-1/2), 25 times lower than what would be expected in a comparable mu-metal shield. The authors identify a 1/f component of the magnetic noise due to magnetization fluctuations and derive general relationships for the Johnson current noise and magnetization noise in cylindrical ferromagnetic shields in terms of their conductivity and complex magnetic permeability.
dc.description4 pages, 3 figures. Published in Appl. Phys. Lett.; replacement reflects published work
dc.identifierhttps://arxiv.org/abs/physics/0703115
dc.identifierhttp://arxiv.org/abs/physics/0703115
dc.identifierAppl. Phys. Lett. 90, 223501 (2007)
dc.identifierdoi:10.1063/1.2737357
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135045
dc.subjectAtomic Physics
dc.subjectInstrumentation and Detectors
dc.titleA low-noise ferrite magnetic shield
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