Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn 0.9 Co 0.1 O Thin Films Using Atom Probe Tomography - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of the American Chemical Society Année : 2011

Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn 0.9 Co 0.1 O Thin Films Using Atom Probe Tomography

Résumé

Nanosized Co clusters (of about 3 nm size) were unambiguously identified in Co-doped ZnO thin films by atom probe tomography. These clusters are directly correlated to the superparamagnetic relaxation observed by ZFC/FC magnetization measurements. These analyses provide strong evidence that the room-temperature ferromagnetism observed in the magnetization curves cannot be attributed to the observed Co clusters. Because there is no experimental evidence of the presence of other secondary phases, our results reinforce the assumption of a defect-induced ferromagnetism in Co-doped ZnO diluted magnetic semiconductors.
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hal-01633468 , version 1 (16-01-2019)

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Citer

Rodrigue Lardé, Etienne Talbot, Philippe Pareige, Herrade Bieber, Guy Schmerber, et al.. Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn 0.9 Co 0.1 O Thin Films Using Atom Probe Tomography. Journal of the American Chemical Society, 2011, 133 (5), pp.1451-1458. ⟨10.1021/ja108290u⟩. ⟨hal-01633468⟩
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