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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, WC
Sharma, SK
Haddad, P
Rocha, TCR
Santos Duque, JG
Zanchet, D
Knobel, M
Abstract: A detailed study of the magnetic properties of colloidal Ni nanoparticles (similar to 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.
Country: EUA
Editor: Springer
Rights: fechado
Identifier DOI: 10.1140/epjb/e2008-00445-9
Date Issue: 2008
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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