Hidden ferromagnetic secondary phases in cobalt-doped Zn0 epitaxial thin films.
The origin of ferromagnetism is investigated in epitaxial Co:ZnO thin films which become weakly ferromagnetic after annealing in Zn vapor. Conventional characterization techniques indicate no change after treatment. However, x-ray photoelectron spectroscopy depth profiling clearly indicates the presence of Co(0) in the Zn-treated films; x-ray absorption fine structure is utilized to identify the secondary phase as ferromagnetic CoZn. This work demonstrates that the potential for ferromagnetic secondary phases must be thoroughly discounted, through painstaking materials characterization, before claims of intrinsic ferromagnetism can be made.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 935293
- Report Number(s):
- ANL/XSD/JA-61604
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: May 2008 Vol. 77
- Country of Publication:
- United States
- Language:
- ENGLISH
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