SURFACE PROPERTIES OF NANOCRYSTALLINE ALLOYS CHARACTERISED BY MÖSSBAUER SPECTROMETRY
Department of Nuclear Physics and Technology, Slovak University of Technology,
Ilkovicova 3, 812 19 Bratislava, Slovakia
FeMoXB (X = Cu, Au) NANOPERM-type nanocrystalline alloys are studied using Mössbauer spectrometry.
Microstructure and magnetic arrangement is reviewed for the surface regions down to the depth of about 100 nm
and for the bulk of the investigated specimens adopting the detection of conversion electrons and transmission
geometry experiments, respectively. Nanocrystalline samples were prepared by a controlled annealing from
originally amorphous precursors. Different temperatures of annealing chosen ensured varying amounts of
nanocrystalline grains. Thus, the effects of mutual interactions among the crystallites and their impact on the
surrounding amorphous retained phase were revealed. At the same time, consequences of composition changes on the
microstructure and hyperfine interactions were inspected. In addition, samples with their surface being modified
by laser irradiation are also discussed.
full paper (pdf, 104 Kb)