Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 10, Issue -, Pages 193-199Publisher
SPRINGER
DOI: 10.1007/s11051-008-9463-3
Keywords
Magnetic nanoclusters; Gas-aggregation deposition; Core-shell nanoparticles; Exchange bias; Aerosols
Categories
Funding
- Romanian Ministry of Research [CEEX 20/2005, PNCDI II 71-060/2007]
- EPSRC
- EU
- Engineering and Physical Sciences Research Council [EP/D001099/1, EP/D051452/1] Funding Source: researchfish
- EPSRC [EP/D051452/1] Funding Source: UKRI
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Fe clusters have been synthesised in ultrahigh-vacuum chamber using a gas-stabilized cluster aggregation method that ensures good control of the cluster size and naturally oxidized in order to obtain Fe/Fe oxide core-shell nanoparticles. The morphology of an individual nanoparticle, as revealed by transmission electron microscopy, consists of a Fe core of an average diameter of 4.4 nm surrounded by an oxide shell of uniform thickness of about 1.2 nm in average. The nanoparticles may be assimilated with a ferro-/antiferromagnetic (FM/AF) system. The morpho-structural features have been correlated with magnetic measurements on the core-shell nanoparticles. A significant exchange bias effect has been measured, when the sample was field-cooled under an applied field of 3 T. As the morphology of core-shell nanoclusters is much more complicated than in FM/AF bilayers of regular thickness due to the particular geometry of the coronal AF layer, the shape and surface anisotropy have to be taken into account for a correct interpretation of the magnetic data.
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