Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Magnetic Shielding

  • Gary R. Scott
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_183

There are numerous uses for magnetic shields in research and consumer electronics. In geophysical research, magnetic shields are used in paleomagnetic laboratories to protect samples and improve the performance of sample magnetometers. Research shields range in size from 10 cm to 15 m.

The irony in magnetic shielding theory is that a shield actually adds another magnetic field. This new field is specifically designed to be equal and opposite to the existing field, resulting in a nullification of, not a removal of the ambient magnetic fields. This is analogous to gravitational forces at Lagrangian points, or the balance of centripetal and gravitational forces on orbiting bodies, or noise cancellation by antiphase headphones.

Materials used

Diverse materials and techniques are used for magnetic shielding. The choice depends on the kind of fields to be opposed (e.g., AC vs DC) and the specific application. In general, shielding can be accomplished by using one of two physical phenomenon,...

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Bibliography

  1. Kirschvink, J.L., 1992. Uniform magnetic fields and double‐wrapped coil systems: improved techniques for the design of bioelectromagnetic experiments. Bioelectromagnetics, 13: 401–411.CrossRefGoogle Scholar
  2. Patton, B.J., and Fitch, J.L., 1962. Design of a room‐size magnetic shield. Journal of Geophysical Research, 67: 1117–1121.Google Scholar
  3. Scott, G.R., and Frohlich, C., 1985. Large‐volume magnetically shielded room, a new design and material. In Kirschvink, J.L., Jones, D.S., and Macfadden, B.J. Magnetite Biomineralization and Magnetoreception in Organisms. New York: Plenum Press, pp. 197–220.Google Scholar
  4. Wills, A.P., 1899. On the magnetic shielding effect of trilamellar spherical and cylindrical shells. Physical Review, 9: 193–213.Google Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Gary R. Scott

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