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Type: Artigo de evento
Title: Enhancement Of Ferromagnetism In Amine/organic Acid Capped Au-nanoparticles By Yttrium-oxide Inclusion
Author: Lesseux G.G.
Iwamoto W.
Rosas V.H.
Vautier-Giougo C.
Rettori D.
Urbano R.R.
Rettori C.
Abstract: In this work we report on the enhancement of the ferromagnetism of aniiue/organic acid capped An nanoparticles (Au-NPs) by incorporation of yttrium(III) oxide. The magnetization measurements, at 2 K, displayed a ferromagnetic (FM) loop with a coercive field of HC ≈ 250 Oe and magnetic saturation moment of Msat ≈ 0.004 μB Per Au atom on the NP surface. Furthermore, an intense FM resonance (FMR) line was observed from 370 K down to 4.2 K, the held for resonance, Hr, slightly shifts toward lower fields and the normalized integrated intensity remains almost constant in the entire investigated range of temperature. These results are discussed in terms of covalent-like bonds between the NP-capping ligands, Y2O3 and the Au atoms, giving rise to an effective hybridization of the 5d-6s electrons at the surface of the AuNPs. This hybridization would be responsible for the Au 5d shell to become magnetic due to uncompensated spins in the 5d orbitals.
Rights: fechado
Identifier DOI: 
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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