Autor(es)

Fabris, F. ; Garcia-Flores, A. F. ; Urbano, R. R. ; Rettori, C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 131, n. 21, p. 8-pg., 2022-06-07.

Resumo

In this work, we report a fundamental study on the exchange interaction between localized rare earth magnetic moments and conduction electrons of Er3+ diluted in Au metallic nanoparticles (NPs) produced by laser ablation in liquid. The study was carried out in Au1-xErx (x & LE; 0.026) bulk metallic alloys and NPs with a mean size of 20 nm. The samples were characterized by means of x-ray diffraction, transmission electron microscopy, magnetic susceptibility, and electron spin resonance (ESR) experiments. The obtained results showed that, despite the high temperature and being far away from chemical equilibrium throughout the laser ablation process, in the AuNPs, the Er3+ (J = 15/2) ground state of the crystal electric field split multiplet remains a & UGamma;(7) (g = 6.79) Kramers doublet with the expected g-shift and T-dependence of the ESR linewidth, preserving the general bulk properties and the cubic symmetry. In addition, the Au1-xErx NPs present narrow ESR residual linewidth suggesting homogeneous Er3+ doping and negligible strain distribution in the Au1-xErx NPs. This new methodology may certainly provide relevant insight into the study of the intrinsic physical properties of dilute rare earth metallic alloys at the nanometer scale seeking quantum size effects and motivates novel technological applications. Published under an exclusive license by AIP Publishing. (AU)

• Processo FAPESP: 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 14/50906-9 - INCT 2014: em Materiais Complexos Funcionais (INOMAT)
• Beneficiário: Fernando Galembeck
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/09673-4 - Apoio técnico e computacional para síntese, caracterização e estudo de nanopartículas metálicas e isolantes
• Beneficiário: Alí Francisco García Flores
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 19/13678-1 - Propriedades magnéticas em estruturas nanoconfinadas: nanopartículas metálicas e isolantes dopadas com terras-raras produzidas por Laser Ablation e síntese química.
• Beneficiário: Fernando Fabris
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado