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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
It is part of: Physical Review B, 2007, vol. 75, núm. 15, p. 155322-1-155322-6
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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