Unshielded three-axis vector operation of a spin-exchange-relaxation-free atomic magnetometer

S. J. Seltzer, M. V. Romalis

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248 Scopus citations


We describe a vector alkali-metal magnetometer that simultaneously and independently measures all three components of the magnetic field. Using a feedback system, the total field at the location of the magnetometer is kept near zero, suppressing the broadening due to spin-exchange collisions. The resonance linewidth and signal strength of the magnetometer compare favorably with two different scalar operation modes in which spin-exchange relaxation is only partially suppressed. Magnetic field sensitivity on the order of 1 pT/ √Hz is demonstrated in a laboratory environment without magnetic shields.

Original languageEnglish (US)
Pages (from-to)4804-4806
Number of pages3
JournalApplied Physics Letters
Issue number20
StatePublished - Nov 15 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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