Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/10636
Title: | Reversible ferromagnetic switching in ZnO:(Co,Mn) powders |
Author: | Rubí, D. Fontcuberta i Griñó, Josep Calleja Lázaro, Alberto Aragonès, Ll. Garcia Capdevila, Xavier Segarra Rubí, Mercè |
Keywords: | Materials Propietats magnètiques Magnetic properties and materials |
Issue Date: | 2007 |
Publisher: | The American Physical Society |
Abstract: | We report here on the magnetic properties of ZnO:Mn- and ZnO:Co-doped nanoparticles. We have found that the ferromagnetism of ZnO:Mn can be switched on and off by consecutive low-temperature annealings in O2 and N2, respectively, while the opposite phenomenology was observed for ZnO:Co. These results suggest that different defects (presumably n-type for ZnO:Co and p-type for ZnO:Mn) are required to induce a ferromagnetic coupling in each case. We will argue that ferromagnetism is likely to be restricted to a very thin, nanometric layer at the grain surface. These findings reveal and give insight into the dramatic relevance of surface effects to the occurrence of ferromagnetism in ZnO-doped oxides. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/physrevb.75.155322 |
It is part of: | Physical Review B, 2007, vol. 75, núm. 15, p. 155322-1-155322-6 |
URI: | http://hdl.handle.net/2445/10636 |
Related resource: | http://dx.doi.org/10.1103/physrevb.75.155322 |
ISSN: | 0163-1829 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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