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We report an optical inelastic-wave-mixing-enhanced atomic magnetometrytechnique that results in nT-level magnetic field detection at temperaturescompatible with the human body without magnetic shielding, zero-fieldcompensation, or high-frequency modulated phase-locking spectroscopy. UsingGaussian magnetic pulses that mimic the transient magnetic field produced by anaction potential on a frog's nerve, we demonstrate more than 300,000-fold(550-fold) enhancement of magneto-optical rotation signal powerspectral-density (power amplitude) over the conventional single-beam$\Lambda-$scheme atomic magnetometry method. This new technique may bringpossibilities for extremely sensitive magnetic field imaging of biologicalsystems accessible via an optical fiber in clinical environments.

Nanotesla-level, shield-less, field-compensation-free, wave-mixing-enhanced body-temperature atomic magnetometry for biomagnetism