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The noble-alkali comagnetometer, developed in recent years, has been shown tobe a very accurate measuring device of anomalous magnetic-like fields. Anultra-light relic axion-like particle can source an anomalous field thatpermeates space, allowing for its detection by comagnetometers. Here we derivenew constraints on relic axion-like particles interaction with neutrons andelectrons from old comagnetometer data. We show that the decade-oldexperimental data place the most stringent terrestrial constraints to date onultra-light axion-like particles coupled to neutrons. The constraints arecomparable to those from stellar cooling, providing a complementary probe.Future planned improvements of comagnetometer measurements through alteredgeometry, constituent content and data analysis techniques could enhance thesensitivity to axion-like relics coupled to nucleons or electrons by manyorders of magnitude.

Axion-like Relics: New Constraints from Old Comagnetometer Data