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We study magnetic order of the Heisenberg model on a non-Bravais lattice based on the Popov-Fedotov trick for exactly treating the local constraint on on-site spin number. The spin operators are represented by auxiliary fermions and an imaginary chemical potential is introduced. The following steps are sketched: i) Parameterizing classical ground state by a magnetic ordering vector and angles between the spins within a unit cell. ii) Going to a local coordinate system. ii) Using functionaldoi:10.1088/1742-6596/1274/1/012012 fatcat:gj2zwsrasvcjbbvvwoauo234nq