Magnetic properties of free cobalt clusters

Morphology and capping effects in the magnetic and magneto-optical properties of nanoparticulate Co films

“…In particular, nanoparticles of transition metals such as cobalt, iron, or nickel are highly magnetic with moments that exceed the bulk values. [1][2][3] The reduced coordination of the atoms at the surface is one of the reasons of this behavior since it enhances the orbital magnetic moment. 4,5 The examination of the influence of different physical parameters on the spatial and magnetic order in nanoparticulate systems should contribute to a better understanding of the nature of the interactions responsible for the magnetism.…”

“…4,5 The examination of the influence of different physical parameters on the spatial and magnetic order in nanoparticulate systems should contribute to a better understanding of the nature of the interactions responsible for the magnetism. 1 This in turn will enable the magnetic properties of these materials to be tailored to specific applications, such as for magnetic recording.…”

Isomer selective infrared spectroscopy of neutral metal clusters

“…For metal clusters, the coexistence of different isomeric structures has been experimentally revealed using mainly two methods: ͑i͒ investigation of the kinetics with reactant molecules, where bi-or multipleexponential reaction kinetics are signatures for the presence of isomers with different reactivities, [1][2][3][4][5] or ͑ii͒ ͑ion͒ mobility measurements, where isomers with different collision cross sections can be separated and detected via their different arrival time distributions. [6][7][8] Further evidence for metal cluster isomers is obtained from the measurements of magnetic moments, 9 from unimolecular photodissociation dynamics, 10 and from photoelectron spectroscopy. 11 Very recently, optical spectroscopy on matrix deposited silver clusters allowed for the identification of the presence of silver cluster isomers.…”

“…19 Here we report on FIR-MPD spectroscopic studies of neutral metal clusters. We are focusing in particular on Nb 9 , to demonstrate that isomer specific vibrational spectra can be obtained. The structures of the isomers are determined by comparison of the observed FIR-MPD spectra to calculated IR absorption spectra as obtained from density-functional theory calculations.…”

Biosynthesis and stabilization of Au and Au–Ag alloy nanoparticles by fungus,Fusarium semitectum

“…Microorganisms, including viruses, bacteria, and fungi [3,4], grow into unique and structurally interesting forms that have been used by many researchers as templates for the self-organization of inorganic materials with the aim of realizing functional macrostructures. In such assemblies, the inherent uniformity of the biological structures can be combined with the functional properties of inorganic nanoparticles [5][6][7] (such as conductivity and optical activity) to realize functional macrostructures. As an example, a dense assembly of nanoparticles on filamentous fungi [8] with typical hyphal diameters of a few micrometers (varying from species to species) and lengths varying from tens of micrometers to a few millimeters could find immediate applications as circuit components.…”