Antiperovskite ${\mathrm{Co}}_4\mathrm{N}$ with a large magnetic moment and high spin-polarization is a promising candidate for spintronic applications. However, its stabilization requires a careful attention due to the high formation enthalpy and N diffusion. This study demonstrates that Pd incorporation stabilizes antiperovskite ${\mathrm{Co}}_4\mathrm{N}$ thin films, reduces defects, and enables tuneable magnetization dynamic properties. Ferromagnetic resonance studies show that Pd doping in ${\mathrm{Co}}_4\mathrm{N}$ causes a systematic rise in Gilbert damping accompanied by a reduction in inhomogeneous broadening. Along with laboratory techniques, advanced synchrotron and neutron methodologies—hard x-ray photoelectron spectroscopy, extended x-ray absorption fine structure, and polarized neutron reflectivity have been utilized to elucidate the role of Pd doping on the structural, electronic, and magnetic properties of ${\mathrm{Co}}_4\mathrm{N}$. Thermal annealing studies revealed that Pd doping leads to enhanced thermal stability of ${\mathrm{Co}}_4\mathrm{N}$. Overall, this study presents an approach for achieving stabilization of antiperovskite ${\mathrm{Co}}_4\mathrm{N}$ by Pd doping along with enhanced structural and magnetic uniformity and tunable magnetization dynamic properties without a significant reduction of magnetic moment.

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• Magnetism
• Magnetization dynamics
• Spintronics
• Structural properties
• Nitrides