Magnetoencephalography with an atomic magnetometer

H. Xia, A. Ben-Amar Baranga, D. Hoffman, M. V. Romalis

Research output: Contribution to journalArticlepeer-review

363 Scopus citations


The authors demonstrate detection and mapping of brain magnetic fields evoked by auditory stimulation with a noncryogenic magnetometer based on spin precession of potassium atoms in spin-exchange-relaxation-free regime. Optical readout using a photodiode array allows flexibility in detector placement while using common elements for most components of the multichannel system. Absence of a cryogenic dewar eliminates magnetic Johnson noise from radiation shields and allows the use of a compact magnetic shield with a high shielding factor. The magnetometer sensitivity is currently equal to 3.5 fT Hz12 at 10 Hz, similar to superconducting quantum interference device magnetoencephalography systems.

Original languageEnglish
Article number211104
JournalApplied Physics Letters
Issue number21
StatePublished - 15 Dec 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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