Absence of Exchange Interaction Between Localized Magnetic Moments and Conduction-Electrons in Magnetic Ions Diluted in Ag-Nanoparticles

作者：Vargas J M^*; Iwamoto W; Holanda L M Jr; Oseroff S B; Pagliuso P G; Rettori C

来源：Journal of Nanoscience and Nanotechnology, 2011, 11(3): 2126-2131.

DOI：10.1166/jnn.2011.3528

• ESR
• Magnetism
• Ag-Nanoparticles
• Nanocrystalline Materials
• Chemical Synthesis Methods
• Quenching

The Electron Spin Resonance (ESR) of diluted magnetic ions (MI) of Er3+, Yb3+ and Mn2+ in Ag nanoparticles (NPs) is reported. Monodisperse samples of Ag NPs doped with these MI were synthesized by reducing silver nitrate and MI-oxides. This simple method can be extended to all rare-earths. The measurements of the g-values and hyperfine splittings indicates that the MI are located at cubic sites in the Ag:MI NPs. The ESR spectra show that there is no g-shift and Korringa-relaxation due to the exchange interaction between the MI and the conduction electrons, suggesting that the exchange interaction is absent in the Ag:MI NPs. Thus, the nature of this interaction needs to be reexamined at the nanoscale range.

• 出版日期2011-3