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Improved constraints on exotic spin-dependent interactions are established atthe micrometer scale by a magnetometer with ensembles of nitrogen-vacancy (NV)centers in diamond. A thin layer of NV electronic spin ensembles is utilized asthe sensor, and a lead sphere is taken as the source of the nucleons. Theexotic spin-dependent interactions are explored by detecting the possibleeffective magnetic fields by the sensor. Stringent bounds on an exoticparity-odd spin- and velocity-dependent interaction are set within the forcerange from 5 to 500 $\mu$m. The upper limit of the corresponding couplingconstant, $g_A^eg_V^N$, is improved by more than three orders of magnitude at330 $\mu$m. Improved constraints of $P, T$-violating scalar-pseudoscalarnucleon-electron interactions, are established within the force range from 6 to45 $\mu$m. The limit of the corresponding coupling constant, $g_S^Ng_P^e$, isimproved by more than one order of magnitude at 30 $\mu$m. Our result showsthat a magnetometer with a NV ensemble can be a powerful platform for probingexotic spin-dependent interactions.

Experimental Constraints on Exotic Spin-Dependent Interactions by a Magnetometer with Ensembles of Nitrogen-Vacancy Centers in Diamond