A low-noise ferrite magnetic shield
By T. Kornack, Sylvia J. Smullin, Seung-Kyun Lee, M. Romalis. 2007
233 citations recorded by the source corpus.
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 0.75fTHz−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.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering
View Paper: https://www.semanticscholar.org/paper/ab997e4560453c80b9bac37dbc516fd0a4962627
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In Atomic and Molecular Physics, and Optics
In Biomedical Engineering
Citations in the corpus
- Simultaneous Broadband Vector Magnetometry Using Solid-State Spins (2018, background): “3 applied sequentially to the four NV orientations, since both schemes require eight pulse sequences to reconstruct the magnetic field vector (see Supplemental Material).”
- Developments in alkali -metal atomic magnetometry (2008, methodology): “Operation in nonconductive ferrite shields should reduce the ambient magnetic noise (Kornack et al., 2007), and we expect that performing a gradiometric measurement using the cell designs illustrated in Figure 6.”
- Electric dipole moments of atoms, molecules, nuclei, and particles (2017, background): “Cryogenic magnetically shielded environments have been demonstrated, e.g. by Cabrera et al. (1989) and Kornack et al. (2007), and these concepts have been extended to larger volumes for the SNS cryogenic nEDM experiment (Slutsky et al., 2017).”