| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1605228 | Journal of Alloys and Compounds | 2016 | 5 Pages |
Abstract
By combing structural characterizations and comparative annealing experiments, we found that uniformly annealed ZnO:Cu films exhibited robust room temperature ferromagnetism, while non-uniform annealed ZnO:Cu films result in magnetism quenching. Due to inhomogeneous Ostwald ripening during nanocrystal films annealing, Cu2+ ions exist in adsorbed state, depressing nanocrystals surface state. The dissociative Cu2+ ions will compensate d0 ferromagnetism and interference dual-donor (Vo and Zni) mediated indirect double exchange process. Hence, for colloidal chemistry constructed particles thin films, annealing control must be uniform, reducing the introduction of magnetic instability.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Le Zhang, Liping Zhu, Liang Hu, Yiyu Zeng, Zhizhen Ye,