Ferromagnetism in Fe-Implanted a-plane ZnO Films
Fe ions of dose 5x10{sup 16} cm{sup -2} were implanted at 200 keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction {omega}-rocking curves and {phi} scans, whereas x-ray absorption spectroscopy identified the presence of both Fe{sup 2+} and Fe{sup 3+} ions, as well as changes in their relative concentration during postannealing. Superconducting quantum interference device measurements show that the as-implanted and postannealed films are ferromagnetic at room temperature. The saturation magnetization reduces during annealing possibly due to the decrease in the number of oxygen vacancies.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 914380
- Report Number(s):
- BNL-78948-2007-JA; APPLAB; TRN: US200809%%212
- Journal Information:
- Appl. Phys. Lett., Vol. 89; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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