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Type: Artigo de periódico
Title: Complex Magnetic Internal Order In Structurally Disordered Ni Nanoparticles
Author: De Biasi E.
Leon-Vanegas A.
Nunes W.C.
Sharma S.K.
Haddad P.
Rocha T.C.R.
Duque J.G.S.
Zanchet D.
Knobel M.
Abstract: A detailed study of the magnetic properties of colloidal Ni nanoparticles (∼5.2 nm) that do not present long range order is presented. Two magnetic contributions were observed at high temperatures (>25 K), a dominating paramagnetic one and a ferromagnetic contribution, detected by ferromagnetic resonance and low field magnetic measurements. Interestingly, the ferromagnetic behavior does not follow a classical superparamagnetic description. The effective anisotropy increases at low temperatures due to interactions among the ferromagnetic clusters, which leads the system to a frustrated state.
Rights: fechado
Identifier DOI: 10.1140/epjb/e2008-00445-9
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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