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Reversible Ferromagnetic Switching in Zno:(Co,Mn) Powders | | D. Rubi
; J. Fontcuberta
; A. Calleja
; Ll. Aragones
; X.G. Capdevila
; M. Segarra
; | | Date: |
19 Jan 2007 | | Subject: | Materials Science | | 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 for the occurrence of ferromagnetism in ZnO doped oxides. | | Source: | arXiv, cond-mat/0701473 | | Services: | Forum | Review | PDF | Favorites | |
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