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Role of dipolar interactions in a system of Ni nanoparticles studied by magnetic susceptibility measurements
dc.contributor.author | Masunaga, Sueli Hatsumi | pt_BR |
dc.contributor.author | Jardim, Renato de Figueiredo | pt_BR |
dc.contributor.author | Fichtner, Paulo Fernando Papaleo | pt_BR |
dc.contributor.author | Rivas, J. | pt_BR |
dc.date.accessioned | 2015-06-19T02:00:40Z | pt_BR |
dc.date.issued | 2009 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/117993 | pt_BR |
dc.description.abstract | The role of dipolar interactions among Ni nanoparticles NPs embedded in an amorphous SiO2 /C matrix with different concentrations has been studied performing ac magnetic susceptibility ac measurements. For very diluted samples, with Ni concentrations 4 wt % Ni or very weak dipolar interactions, the data are well described by the Néel-Arrhenius law. Increasing Ni concentration to values up to 12.8 wt % Ni results in changes in the Néel-Arrhenius behavior, the dipolar interactions become important, and need to be considered to describe the magnetic response of the NPs system. We have found no evidence of a spin-glasslike behavior in our Ni NP systems even when dipolar interactions are clearly present. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. Vol. 80, no. 18 (Nov. 2009), p. 184428-1 a 184428-7 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Propriedades magnéticas | pt_BR |
dc.subject | Materiais ferromagnéticos | pt_BR |
dc.subject | Nanopartículas | pt_BR |
dc.title | Role of dipolar interactions in a system of Ni nanoparticles studied by magnetic susceptibility measurements | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000967956 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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