Exchange interaction between localized magnetic moments and conduction-electrons in Er doped gold nanoparticles synthesized by laser ablation in water

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 ≤ 0.026) bulk metallic allo...

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Bibliographic Details
Published inJournal of applied physics Vol. 131; no. 21
Main Authors Fabris, F., García-Flores, A. F., Urbano, R. R., Rettori, C.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 07.06.2022
Subjects
Ablation
Conduction electrons
Dilution
Electric fields
Electron paramagnetic resonance
Electron spin
Electrons
Erbium
Gold
High temperature
Laser ablation
Lasers
Magnetic moments
Magnetic permeability
Magnetism
Nanoparticles
Physical properties
Size effects
Spin resonance
Strain distribution
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Summary: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 ≤ 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 Γ7 (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.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0089296