Absence of exchange interaction between localized magnetic moments and conduction-electrons in diluted Er{sup 3+} gold-nanoparticles

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4867126· OSTI ID:22273780

Urbano, R. R. ^[1]; Iwamoto, W. ^[1]; García-Flores, A. F. ^[2]; Rettori, C. ^[1]

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1. Instituto de Física “Gleb Wataghin,” UNICAMP, 13083-859 Campinas, São Paulo (Brazil)
2. Centro de Ciências Naturais e Humanas, UFABC, 09210-971 Santo André, São Paulo (Brazil)

The Electron Spin Resonance (ESR) of diluted Er{sup 3+} magnetic ions in Au nanoparticles (NPs) is reported. The NPs were synthesized by reducing chloro triphenyl-phosphine gold(I) and erbium(III) trifluoroacetate. The Er{sup 3+} g-value along with the observed hyperfine splitting indicate that the Er{sup 3+} impurities are in a local cubic symmetry. Furthermore, the Er{sup 3+} ESR spectra show that the exchange interaction between the 4f and the conduction electrons (ce) is absent or negligible in Au{sub 1–x}Er{sub x} NPs, in contrast to the ESR results in bulk Au{sub 1–x}Er{sub x}. Therefore, the nature of this interaction needs to be reexamined at the nano scale range.

• OSTI ID: 22273780
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTRA
ELECTRON SPIN RESONANCE
ELECTRONS
ERBIUM COMPOUNDS
ERBIUM IONS
EXCHANGE INTERACTIONS
G VALUE
GOLD
GOLD COMPOUNDS
MAGNETIC MOMENTS
NANOSTRUCTURES
PARTICLES
PHOSPHINES