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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Sonochemical Synthesis and Magnetism in Co-doped ZnO Nanoparticles

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Autor(es):
Arruda, Larisa B. [1] ; Leite, Douglas M. G. [1] ; Orlandi, Marcelo O. [2] ; Ortiz, Wilson A. [3] ; Lisboa-Filho, Paulo Noronha [4]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] POSMAT Programa Posgrad Ciencia & Tecnol Mat UNES, Bauru - Brazil
[2] UNESP Univ Estadual Paulista, Dept Fis Quim, Inst Quim, Araraquara - Brazil
[3] UFSCar Univ Fed Sao Carlos, Dept Fis, Sao Carlos, SP - Brazil
[4] UNESP Univ Estadual Paulista, Dept Fis, Fac Ciencias, Bauru - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Superconductivity and Novel Magnetism; v. 26, n. 7, p. 2515-2519, JUL 2013.
Citações Web of Science: 7
Resumo

The understanding and control of ferromagnetism in diluted magnetic semiconducting oxides (DMO) is a special challenge in solid-state physics and materials science due to its impact in magneto-optical devices and spintronics. Several studies and mechanisms have been proposed to explain intrinsic ferromagnetism in DMO compounds since the theoretical prediction of room-temperature ferromagnetism. However, genuine and intrinsic ferromagnetism in 3d-transition metal-doped n-type ZnO semiconductors is still a controversial issue. Furthermore, for DMO nanoparticles, some special physical and chemical effects may also play a role. In this contribution, structural and magnetic properties of sonochemically prepared cobalt-doped ZnO nanoparticles were investigated. A set of ZnO samples was prepared varying cobalt molar concentration and time of ultrasonic exposure. The obtained results showed that single phase samples can be obtained by the sonochemical method. However, cobalt nanoclusters can be detected depending on synthesis conditions. Magnetic measurements indicated a possible ferromagnetic response, associated to defects and cobalt substitutions at the zinc site by cobalt. However, ferromagnetism is depleted at higher magnetic fields. Also, an antiferromagnetic response is detected due to cobalt oxide cluster at high cobalt molar concentrations. (AU)

Processo FAPESP: 09/14628-6 - Nanoestruturas óxidas magnéticas diluídas
Beneficiário:Paulo Noronha Lisboa Filho
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 06/05627-8 - Otimização estrutural, óptica e magnética de filmes de Ga(1-x)Mn(x)N depositados por sputtering reativo
Beneficiário:Douglas Marcel Gonçalves Leite
Linha de fomento: Bolsas no Brasil - Doutorado