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We report here a comprehensive study of the AFM structures of the Eu and Mnmagnetic sublattices as well as the interplay between Eu and Mn magnetism inthis compound by using both polarized and non-polarized single-crystal neutrondiffraction. Magnetic susceptibility, specific heat capacity measurements andthe temperature dependence of magnetic diffractions suggest that the AFMordering temperature of the Eu and Mn moments is at 22 and 337 K, respectively.The magnetic moments of both Eu and Mn ions are oriented along thecrystallographic $c$ axis, and the respective magnetic propagation vector is$\textbf{k}_{Eu} = (0,0,1)$ and $\textbf{k}_{Mn}=(0,0,0)$. With proper neutronabsorption correction, the ordered moments are refined at 3 K as 7.7(1) $\mu_B$and 4.1(1) $\mu_B$ for the Eu and Mn ions, respectively. In addition, aspin-flop (SF) phase transition of the Eu moments in an applied magnetic fieldalong the $c$ axis was confirmed to take place at a critical field of B$_c$$\sim$ 5.3 T. The evolution of the Eu magnetic moment direction as a functionof the applied magnetic field in the SF phase was also determined. Clear kinksin both field and temperature dependence of the magnetic reflections ($\pm1$,0, 1) of Mn were observed at the onset of the SF phase transition and the AFMorder of the Eu moments, respectively. This unambiguously indicates theexistence of a strong coupling between Eu and Mn magnetism. The interplaybetween two magnetic sublattices could bring new possibilities to tune Diracfermions via changing magnetic structures by applied fields in this class ofmagnetic topological semimetals.

Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi$_2$