| Autor: |
Veronique Pierron-Bohnes, Eric Beaurepaire, Guy Schmerber, Christian Meny, Aziz Dinia, Pierre Panissod |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 286:37-40 |
| ISSN: |
0304-8853 |
| Popis: |
We have used reactive magnetron co-sputtering to grow Zn 0.75 Co 0.25 O dilute magnetic semiconductor on Al 2 O 3 (0 0 0 1) substrates at 400 and 600 °C. X-ray diffraction has shown that the films are epitaxied with the epitaxial relation Zn 0.75 Co 0.25 O(0 0 0 1) 〈 1 0 1 ¯ 0 〉 //Al 2 O 3 (0 0 0 1) 〈 1 1 2 ¯ 0 〉 . The rocking curve of the 600 °C grown film has a 0.8° FWHM indicating a good structural quality of the film. For both films, we observe a ferromagnetic hysteresis loop at low and room temperature. This is consistent with the thermal variation of the magnetic susceptibility, which shows that the ferromagnetism is present for a temperature as high as 300 K. In addition, magnetization loops recorded at 10 K with the magnetic field along and perpendicular to the film plane evidence a perpendicular magnetic anisotropy with the easy magnetization axis along the growth axis. The origin of the ferromagnetism in these films is ascribed to the Co 2+ atoms from structural, magnetic, and optical transmission measurements. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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