Journal
PHYSICAL REVIEW B
Volume 80, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.035331
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Funding
- Sonderforschungsbereich [SFB 762]
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We have investigated the magnetic properties of pure ZnO thin films grown under N-2 pressure on a-, c-, and r-plane Al2O3 substrates by pulsed-laser deposition. The substrate temperature and the N-2 pressure were varied from room temperature to 570 degrees C and from 0.007 to 1.0 mbar, respectively. The magnetic properties of bare substrates and ZnO films were investigated by SQUID magnetometry. ZnO films grown on c- and a-plane Al2O3 substrates did not show significant ferromagnetism. However, ZnO films grown on r-plane Al2O3 showed reproducible ferromagnetism at 300 K when grown at 300-400 degrees C and 0.1-1.0 mbar N-2 pressure. Positron annihilation spectroscopy measurements as well as density-functional theory calculations suggest that the ferromagnetism in ZnO films is related to Zn vacancies.
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