We present that $\mathrm{M}{\mathrm{n}}_{4-x}\mathrm{C}{\mathrm{u}}_x\mathrm{N}$ films grown by molecular beam epitaxy on $\mathrm{SrTi}{\mathrm{O}}_3$(001) have a magnetic compensation (MC) composition with noncollinear magnetic components at room temperature. Due to the high crystalline quality and perpendicular magnetic anisotropy, the remanent magnetization ratio was almost 100% for $x\le 0.6$. At 0.10 ≤ $x\le 0.15$, the saturation magnetization was the smallest, while the coercivity was the largest. The hysteresis curves obtained by both the magneto-optical Kerr effect and the anomalous Hall effect showed sign reversal between $x=0.1$ and 0.15. X-ray magnetic circular dichroism (XMCD) spectra at the Cu $L_{2,3}$ edges also showed sign reversal over the entire energy range. These results provide evidence that the MC composition is in the vicinity of $x\sim 0.1$. However, the XMCD spectra at the Mn $L_{2,3}$ edges showed a different magnetic structure change from that of Ni-doped $\mathrm{M}{\mathrm{n}}_4\mathrm{N}$, which also exhibits MC. A magnetic structure model for $\mathrm{M}{\mathrm{n}}_{4-x}\mathrm{C}{\mathrm{u}}_x\mathrm{N}$ is discussed in comparison with the experimental results.

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• Spintronics
• Magnetic thin films
• Film deposition
• Transport techniques
• X-ray absorption spectroscopy
• X-ray magnetic circular dichroism