G.B. Khomutov et al. / Surface Science 532–535 (2003) 287–293
293
generation of nanoparticles under short UV illu-
Acknowledgements
mination conditions is illustrated by Fig. 4(b).
Formation of chain aggregates is characteristic for
the systems with colloid magnetic particles [16].
Chains of self-organized magnetite nanoparticles
are present also in magnetotactic bacteria and play
important physiological role in their space orien-
tation [17]. Figs. 3(c) and 4(c) demonstrate the
effect of external magnetic field applied during the
nanoparticles synthesis on the shape of resulted
nanoparticles. The shape of substantial part
of nanoparticles was changed from circular plate-
like and ring-like to the field-aligned ellipsoidal
and needle-like when external magnetic field par-
allel to the plane of particulate monolayer was
applied during the synthesis. The evident correla-
tion between the direction of the applied field and
the long axis of anisotropic nanoparticles grown
and deposited under the applied field was ob-
served. These AFM and TEM results are in good
agreement with STM data obtained earlier in our
group on the effects of applied fields on the mor-
phology of magnetic iron-containing nanoparticles
This work was supported by Russian Founda-
tion for Basic Researches (Grant 02-03-33158),
INTAS(Grant 99-864), I ST C (Grant 1991).
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