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We report room temperature ferromagnetism enhancement of Cu-doped ZnOS (Zn 1− x Cu x O 1− y S y ) alloy thin films with high hole concentration. The Zn 0.91 Cu 0.09 O 0.92 S 0.08 alloy thin films with a hole concentration of 4.3 × 10 19 cm −3 show the strongest magnetization of 1.5μ B /Cu. First-principles calculation shows that high hole concentration stabilizes the ferromagnetic ordering in the Zn 1− x Cu x O 1− y S y system, indicating a strong correlation between ferromagnetic stability and hole concentration. These results suggest that the Zn 1− x Cu x O 1− y S y alloy with high hole concentration is promising to find applications in spintronic devices.
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Li et al. (2012) studied this question.
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