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Type: Artigo de evento
Title: Ferromagnetic Resonance In Amine/organic Acid Caped Au-nanoparticles Assisted By Yttrium-oxide
Author: Lesseux G.G.
Iwamoto W.
Rosas V.H.
Vautier-Giongo C.
Rettori D.
Urbano R.R.
Rettori C.
Abstract: In this study we report on the magnetic properties of amine/organic acid caped Au-nanoparticles (Au-NPs) assisted by yttrium-oxide (Y 2O 3) with diameters ranging between 20 and 60 nm, prepared by somewhat modified chemical route already described in the literature. The magnetization results show a ferromagnetic (FM) loop with negligible coercive field and a magnetic saturation of ∼0.1 emu/gAu at 2 K. Furthermore, an intense magnetic resonance was observed from room-T down to 4.2 K with the following features: i) the field for resonance, H R, is sample and weakly T-dependent; ii) the line width, ΔH PP, broadens at low-T; and iii) the resonance intensity remains almost constant in the entire T-region. The observed resonance is the signature of a ferromagnetic resonance (FMR). To the best of our knowledge this is the first clear report on FMR in magnetic caped Au-NPs. These features characterize our Au-NPs as FM ones. Our results are discussed in terms of the interactions established between the capping ligands and the surface of the Au-NPs which stimulate an effective hybridization of the 5d-6s conduction electrons of the Au atoms, allowing the Au 5d shell to become magnetic due to uncompensated 5d spins.
Rights: fechado
Identifier DOI: 
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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