Abstract
Optical demagnetization effect has been observed in a defect-rich ZnO:Cu film. Phenomenally, UV illumination can effectively quench dual-donor oxygen vacancy (VO) and interstitial zinc (Zni) mediated magnetic ordering (90% loss) with carrier recapture in ionized Zni (Zni2+ rather than Zni+) traps. The involvement of carriers by means of metal Zn vapor annealing provides a bound carrier related magnetic scenario, stressing a more significant place of bound carrier rather than free carrier. Using light correlated electron spin resonance and magnetic measurements, the magnetic “on” and “off” state can be continuously manipulated via UV light, which is explained by the reversible process of [Cus+/Cus2+] + Zni2+ ↔ [Cus+, h] + Zni+ (s and h denote the substitutional Cu ions on Zn sites in ZnO lattice and hole carrier, respectively). A slow charge-transfer process (∼15 μs) from Zni+ bound carriers to [Cus+, h] states determines the unexpected optical demagnetization, well corresponding to control experiments.
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