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Mn2GaC (space group P63/mmc) is a laminated material consisting of Mn2C layers interleaved with Ga layers. The competition between antiferromagnetic and ferromagnetic interactions within the Mn2C planes gives rise to complex magnetic behaviors. It orders magnetically below TN = 507 K and shows another magnetic transition at TC = 220 K. We employed neutron diffraction to study the nature of the magnetic order with single crystal neutron diffractometer D10 at ILL and WISH at ISIS. We identified two sets of reflections that are consistent with two propagation vectors, q1= (0 ,0, 2/3) and q2=(0, 0, 0.54) at both 300 K and 1.5 K, where q1 is predominant at 300 K while q2 is stronger at 1.5 K. By fitting the integrated intensity of the magnetic reflections and by considering the presence and absence of certain peaks, we proposed a transverse spiral structure along c axis.
