Effect of Cu Co-doping on the magnetism of Zn0.95Co0.05O films |
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Authors: | Jian-jun Li Jin-bo Zhu Li-ting Zhang Yin Liu Wei-chang Hao |
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Institution: | 1. Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China 2. Center of Materials Physics and Chemistry, Beihang University, Beijing, 100191, China
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Abstract: | Zn0.95?x Co0.05Cu x O (atomic ratio, x = 0?C8%) thin films are fabricated on Si(111) substrate by reactive magnetron sputtering method. Detailed characterizations indicate that the doped Cu ions substitute the Zn2+ ions in ZnO lattice. The doped Cu ions are in +1 and +2 mixture valent state. The ferromagnetism of the Zn0.95?x Co0.05Cu x O film increases gradually with the increase of the Cu+ ion concentration till x = 6%, but decreases for higher Cu concentration. Experimental results indicate that the increase of ferromagnetism is not owing to the magnetic contribution of Cu+ ions themselves, but owing to the enhancement of magnetic interaction between Co2+ ions, which suggests that p-type doping of Cu+ ions plays an important role in mediating the ferromagnetic coupling between Co ions. |
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Keywords: | Zno 95-xCo0 o5CuxO films magnetic semiconductors bound magnetic polaron model co-doping |
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