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Searches for pseudo-magnetic spin couplings require implementation oftechniques capable of sensitive detection of such interactions. WhileSpin-Exchange Relaxation Free (SERF) magnetometry is one of the most powerfulapproaches enabling the searches, it suffers from a strong magnetic coupling,deteriorating the pseudo-magnetic coupling sensitivity. To address thisproblem, here, we compare, via numerical simulations, the performance of SERFmagnetometer and noble-gas-alkali-metal co-magnetometer, operating in aso-called self-compensating regime. We demonstrate that the co-magnetometerallows reduction of the sensitivity to low-frequency magnetic fields withoutloss of the sensitivity to nonmagnetic couplings. Based on that we investigatethe responses of both systems to the oscillating and transient spinperturbations. Our simulations reveal about five orders of magnitude strongerresponse to the neutron pseudo-magnetic coupling and about three orders ofmagnitude stronger response to the proton pseudo-magnetic coupling of theco-magnetometer than those of the SERF magnetometer. Different frequencyresponses of the co-magnetometer to magnetic and nonmagnetic perturbationsenables differentiation between these two types of interactions. This outlinesthe ability to implement the co-magnetometer as an advanced sensor for theGlobal Network of Optical Magnetometer for Exotic Physics searches (GNOME),aiming at detection of ultra-light bosons (e.g., axion-like particles).

Response of atomic spin-based sensors to magnetic and nonmagnetic perturbations