Abstract
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 language | English (US) |
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Article number | 211104 |
Journal | Applied Physics Letters |
Volume | 89 |
Issue number | 21 |
DOIs | |
State | Published - 2006 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)