Impurity concentration study on ferromagnetism in Cu-doped $\chem{TiO_2}$ thin films
We report here the observation of significant room-temperature ferromagnetism in a semiconductor doped with nonmagnetic impurities, Cu-doped rutile ${\rm TiO}_{2}$ thin films grown by reactive magnetron sputtering. Films annealed in air were nonmagnetic while those annealed in vacuum were ferromagne...
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Veröffentlicht in: | Europhysics letters 2007-06, Vol.78 (6) |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We report here the observation of significant room-temperature ferromagnetism in a semiconductor doped with nonmagnetic impurities, Cu-doped rutile ${\rm TiO}_{2}$ thin films grown by reactive magnetron sputtering. Films annealed in air were nonmagnetic while those annealed in vacuum were ferromagnetic with a Curie temperature about 350 K. The magnetic moment per copper atom decreased as the copper concentration increased. These results show that both the oxygen vacancies and the distance between nearest-neighbor copper atoms play a crucial role for the appearance of magnetism. |
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ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/0295-5075/78/67001 |