Reversible Ferromagnetic Switching in Zno:(Co,Mn) Powders

Details Reversible Ferromagnetic Switching in Zno:(Co,Mn) Powders Reversible Ferromagnetic Switching in Zno:(Co,Mn) Powders

2007-01-19

arxiv.org/abs/cond-mat/0701473v1

Physics

Condensed Matter

Materials Science

20 pages, 4 figures

Scientific paper

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 for the occurrence of ferromagnetism in ZnO doped oxides.

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