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http://www.repositorio.ufop.br/jspui/handle/123456789/1111
Título: | Absence of ferromagnetic order in high quality bulk Co-doped ZnO samples. |
Autor(es): | Carvalho, Hugo Bonette de Godoy, Marcio Peron Franco de Pais, Rafael Witter Dias Mir, Mirta Zevallos, Ângela Maria Ortiz de Iikawa, Fernando Brasil, Maria José Santos Pompeu Chitta, Valmir Antônio Ferraz, Wilmar Barbosa Boselli, Marco Aurélio Sabioni, Antônio Claret Soares |
Data do documento: | 2010 |
Referência: | CARVALHO, H. B. de et al. Absence of ferromagnetic order in high quality bulk Co-doped ZnO samples. Journal of Applied Physics, v. 108, n. 3, p. 033914-1/033914-5, 2010. Disponível em: <https://aip.scitation.org/doi/full/10.1063/1.3459885>. Acesso em: 27 fev. . 2019. |
Resumo: | Bulk Zn1−xCoxO 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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/1111 |
ISSN: | 00218979 |
Licença: | O periódico Journal of Applied Physics permite o depósito da versão PDF do editor em Repositório Institucional. Fonte: Sherpa/Romeo <http://www.sherpa.ac.uk/romeo/search.php?issn=0021-8979>. Acesso em: 28 fev. 2014. |
Aparece nas coleções: | DEFIS - Artigos publicados em periódicos |
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