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A low-noise ferrite magnetic shield

Appl. Phys. Lett. 90, 223501 (2007); doi:10.1063/1.2737357

Published 29 May 2007

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T. W. Kornack, S. J. Smullin, S.-K. Lee, and M. V. Romalis
Physics Department, Princeton University, Princeton, New Jersey 08544
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 µ-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. ©2007 American Institute of Physics
History: Received 13 March 2007; accepted 11 April 2007; published 29 May 2007
Permalink: http://link.aip.org/link/?APPLAB/90/223501/1
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KEYWORDS and PACS

Keywords
PACS
  • 41.20.Gz
    Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
  • 07.55.Nk
    Magnetic shielding in instruments
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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