Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/279
Type: Artigo de periódico
Title: Absence of ferromagnetic order in high quality bulk Co-doped ZnO samples
Author: CARVALHO, H. B. de
GODOY, M. P. F. de
PAES, R. W. D.
MIR, M.
ZEVALLOS, A. Ortiz de
IIKAWA, F.
BRASIL, M. J. S. P.
CHITTA, V. A.
FERRAZ, W. B.
BOSELLI, M. A.
SABIONI, A. C. S.
Abstract: Bulk Zn(1-x)Co(x)O samples were synthesized via standard solid-state reaction route with different Co molar concentrations up to 21%. A detailed microstructural analysis was carried out to investigate alternative sources of ferromagnetism, such as secondary phases and nanocrystals embedded in the bulk material. Conjugating different techniques we confirmed the Zn replacement by Co ions in the wurtzite ZnO structure, which retains, however, a high crystalline quality. No segregated secondary phases neither Co-rich nanocrystals were detected. Superconducting quantum interference device magnetometry demonstrates a paramagnetic Curie-Weiss behavior with antiferromagnetic interactions. We discuss the observed room temperature paramagnetism of our samples considering the current models for the magnetic properties of diluted magnetic semiconductors. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3459885]
Country: Estados Unidos
Editor: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS, v.108, n.3, 2010
Rights: aberto
Identifier DOI: 10.1063/1.3459885
Address: http://dx.doi.org/10.1063/1.3459885
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Date Issue: 2010
Appears in Collections:IFGW - Artigos e Materiais de Revistas Científicas

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