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Dual-Axis π-Pulse Magnetometer with Suppressed Spin-Exchange Relaxation
Elena Zhivun1, Michael Bulatowicz1, Alexander Hryciuk1
1Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.
Abstract:
We present a spin-exchange relaxation-free vector magnetometer with suppressed 1/f probe noise, achieved by applying a small dc bias field and a comb of magnetic dc π pulses along the pump direction. This results in a synchronous orthogonal ac response for each of its two sensitive axes. The magnetometer is particularly well suited to applications such as biomagnetism in which the signal to be measured carries a dominant component of its power at low frequencies. The magnetometer reaches a technical noise floor of and at 0.01 Hz. A single-axis dc spin-exchange relaxation-free (SERF) magnetometer sharing the same experimental apparatus attains 61 fT Hz-1 at the same frequency. A noise minimum of and is reached by the magnetometer at10 Hz, compared to 0.7 fT Hz-1 at 25 Hz for a dc SERF magnetometer.
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