Measurement of magnetic fields by monitoring the Larmor precession of atomic spins is commonly used nowadaysbecause of the high sensitivity and absolute measurement. This paper proposes a novel atomic magnetometerbased on the self-sustaining method for large and uctuating magnetic fields. In combination with the indefinitelypersist Larmor precession signal, the sensitivity of the magnetometer increases following a much faster γ~(-1) rulebeyond the atomic coherence lifetime. The maximum magnetic field have been experimentally demonstrated upto 40000 nT, the sensitivity achieved is 20 pT/Hz~(1/2) and the frequency response bandwidth is 5 kHz, respectively.This magnetic field sensor is advantageous for applications requiring high sensitivity over a wide dynamic rangesuch as geology and space physics.
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