You are here: Home :: Area NEM :: Chemistry :: Physical chemistry

Rolf Schaarschuch, Konrad Moras, Werner Riehemann, Boris Brendebach, Hartwig Modrow

Production and Characterisation of Ferromagnetic Nanoscale Metal Powders Produced by Laser Evaporation

Keywords: Laser Evaporation, Nanoparticles, Saturation Magnetisation, Ferrofluids, Co

Ferromagnetic metallic nanoscale particles were produced by laser evaporation of Co, Fe and Fe₃Al targets with vapour condensation in nitrogen, argon or air. The composition and structure of the nanoscale powders were investigated by XRD and XAS. The Fe and Fe₃Al powders condensed in nitrogen or argon consist mainly of the same phase as the targets. Small amounts of various oxides were found too. Condensation in air yields pure oxide nanopowders without metallic phases. From Co targets nanoscale particles with both fcc and hcp structure are obtained. With increasing aggregation gas pressure the mean diameter of the powders increases, leading to a higher saturation magnetisation of the coarser powders. The oxidation stability of the powders can be attributed to oxygen layers on the particles which were found to be 1–2 nm thick.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 220, 01/2006
Pages: 059 - 068

Show full article (external site)

Show all available items of this journal

 

Area NEM