Complex magnetic internal order in structurally disordered Ni nanoparticles
| Autor: | Wallace C. Nunes, Paula S. Haddad, E. De Biasi, Daniela Zanchet, Tulio C. R. Rocha, A. León-Vanegas, J. G. Santos Duque, Marcelo Knobel, Surender K. Sharma |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Magnetic domain Condensed matter physics Condensed Matter Physics Ferromagnetic resonance Magnetic susceptibility Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Paramagnetism Ferromagnetism Magnetic shape-memory alloy Condensed Matter::Strongly Correlated Electrons Superparamagnetism |
| Zdroj: | The European Physical Journal B. 66:503-508 |
| ISSN: | 1434-6036 1434-6028 |
| DOI: | 10.1140/epjb/e2008-00445-9 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|