NANOCOMPOSITES OF VAPOR PHASE DEPOSITED TEFLON AF CONTAINING NICKEL
CLUSTERS
A. Biswas, J. Kanzow, J. Kruse, V. Zaporojtchenko, F. Faupel,
Lehrstuhl für Materialverbunde,Technische Fakultaet der CAU,
Kaiserstr. 2., D-24143 Kiel, Germany and T. Strunskus, Lehrstuhl für
Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstr. 150,
NC 5/28 D-44780 Bochum, Germany and M. Frommberger, A. Ludwig,
E. Quandt, Center of Advanced European Studies and Research, smart
materials group, Friedensplatz 16, D-53111, Bonn, Germany.
Nanocomposite materials of polymer containing magnetic clusters of 3d
metal are promising candidates for high frequency soft magnetic
components and data storage media or low loss tunable microwave
devices, with tailored single domain cluster size, on the nanoscale,
but not too small in order to avoid thermal switching effects of the
magnetic moments. Further, selection of special hydrophobic polymers
like Teflon AF as matrix allow to protect the growing metallic
nanoclusters against oxidation while controlling the cluster size and
distribution, besides being beneficial in reducing eddy current losses
in the film. Vapor phase deposition is shown to be a relatively easy
and effective technique to produce nanocomposites of Teflon AF filled
with nickel clusters close to the single domain limit (~ 7 - 20) nm
while reactions of the reactive nickel atoms with the growing Teflon
AF matrix and cluster oxidation do not take place. TEM investigations
on the fabricated nanocomposites have shown varying degrees of fcc
nickel cluster volume filling based on chosen preparation routes from
co-deposition to sequential multilayer production. Sequential vapor
phase deposition appears to be a promising route to enhance the nickel
cluster volume filling appreciably within the Teflon AF matrix while
retaining the appropriate cluster size. Magnetic properties of the
prepared composite will be discussed.

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