1. Complex magnetic internal order in structurally disordered Ni nanoparticles.
- Author
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De Biasi, E., Léon-Vanegas, A., Nunes, W. C., Sharma, S. K., Haddad, P., Rocha, T. C. R., Duque, J. G. Santos, Zanchet, D., and Knobel, M.
- Subjects
MAGNETIC properties ,RESEARCH ,COLLOIDS ,NANOPARTICLES ,HIGH temperatures - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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