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MnSiN$_2$ is a transition metal nitride with Mn and Si ions displaying anordered distribution on the cation sites of a distorted wurtzite-derivedstructure. The Mn$^{2+}$ ions reside on a 3D diamond-like covalent network withstrong superexchange pathways. We simulate its electronic structure and findthat the N anions in MnSiN$_2$ act as $\sigma$- and $\pi$-donors, which serveto enhance the N-mediated superexchange, leading to the high N\'{e}el orderingtemperature of $T_N$ = 443 K. Polycrystalline samples of MnSiN$_2$ wereprepared to reexamine the magnetic structure and resolve previously reporteddiscrepancies. An additional magnetic canting transition is observed at$T_\mathrm{cant}$ = 433 K and the precise canted ground state magneticstructure has been resolved using a combination of DFT calculations and powderneutron diffraction. The calculations favor a $G$-type antiferromagnetic spinorder with lowering to $Pc^\prime$. Irreducible representation analysis of themagnetic Bragg peaks supports the lowering of the magnetic symmetry. Thecomputed model includes a 10$^\circ$ rotation of the magnetic spins away fromthe crystallographic $c$-axis consistent with measured powder neutrondiffraction data modeling and a small canting of 0.6$^\circ$.

Canted Antiferromagnetism in Polar MnSiN$_2$ with High N\'eel Temperature