A low-noise ferrite magnetic shield

Details A low-noise ferrite magnetic shield A low-noise ferrite magnetic shield

2007-03-11

arxiv.org/abs/physics/0703115v2

Appl. Phys. Lett. 90, 223501 (2007)

Physics

Atomic Physics

4 pages, 3 figures. Published in Appl. Phys. Lett.; replacement reflects published work

Scientific paper

10.1063/1.2737357

Ferrite 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.

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