We report the presence of a magnetic compensation (MC) composition at room temperature in 20 nm thick ${\mathrm{Mn}}_{4-x}{\mathrm{Ag}}_x\mathrm{N}$ $(x=0-1.0)$ epitaxial thin films prepared on ${\mathrm{SrTiO}}_3\left(001\right)$ by molecular beam epitaxy and show that their magnetic structure is significantly altered by Ag doping. Magnetization curves and anomalous Hall effect loops indicate the presence of an MC composition $x_{\mathrm{MC}}\sim 0$.15 at room temperature. X-ray absorption near-edge structure measurements reveal preferential substitution of Ag for Mn atoms at the corner sites. X-ray magnetic circular dichroism measurements show that the magnetic structure changes drastically for $x>x_{\mathrm{MC}}$. These results and various considerations suggest that the ${\mathrm{Mn}}_{4-x}{\mathrm{Ag}}_x\mathrm{N}$ thin film constitutes a noncollinear magnetic structure above $x_{\mathrm{MC}}$. This is significantly different from the previously reported Ni- and Co-doped ${\mathrm{Mn}}_4\mathrm{N}$ epitaxial thin films.

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• Magnetic order
• Magnetotransport
• Spintronics
• Ferrimagnets
• Crystal structures
• Density functional theory
• Epitaxy
• Film deposition
• First-principles calculations
• Magnetization measurements
• Scanning electron microscopy
• X-ray absorption spectroscopy
• X-ray diffraction
• X-ray magnetic circular dichroism
• X-ray reflectivity