Enhanced ferromagnetism in ZnO nanoribbons and clusters passivated with sulfur View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2008-11

AUTHORS

Andrés R. Botello-Méndez, Florentino López-Urías, Mauricio Terrones, Humberto Terrones

ABSTRACT

Inspired by recent experimental results, the electronic and magnetic properties of sulfur-passivated ZnO clusters and zigzag nanoribbons have been studied using first principles calculations in the framework of the local spin density approximation. In the case of the ZnO nanoribbons, the sulfur atoms or thiol groups were attached in different ways to the zinc or oxygen atoms located at the edges, whereas in clusters, the sulfur atoms were set on the surface, mainly interacting with atoms with low-coordinate number. After an exhaustive atomic relaxation, we found that a magnetic moment emerges in zigzag nanoribbons both with and without sulfur-passivation on the edges. However, the magnitude of the magnetic moment is very sensitive to sulfur passivation. In particular, we found that when sulfur is attached to the zinc atoms in an alternating fashion along the ribbon edges, the magnetic moment is a maximum (1.4 µB/unit cell). In the case of clusters, we found that the Zn15O15 cluster exhibits a high spin moment of 5.5 µB when capped with sulfur atoms. Our calculations indicate that sulfur-passivating of ZnO nanosystems could be responsible for recently observed ferromagnetic responses. More... »

PAGES

420-426

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12274-008-8042-3

DOI

http://dx.doi.org/10.1007/s12274-008-8042-3

DIMENSIONS

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