Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ion-beam induced 1D to 3D periodic transformation in nanostructured
  multilayers   Ion-irradiation-induced modifications of a periodic Pt/C multilayer system
containing Fe impurity have been analyzed by transmission electron microscopy
(TEM). The multilayer stack with 16 Pt/C layer pairs (period 4.23 nm) was
fabricated on a glass substrate. A 2 MeV Au$^{2+}$ ion beam was rastered on the
sample to obtain uniformly irradiated strips with fluences from
1$\times10^{14}$ to 1$\times10^{15}$ $ions/cm^2$. Ion-irradiation has been
found to cause preferential migration of Fe towards Pt layers [Nucl. Instr.
Methods Phys. Res. B212 (2003) 530]. Cross-sectional transmission electron
microscopy (XTEM) shows considerable atomic redistribution for irradiation at
the highest ion fluence (1$\times10^{15}$ $ions/cm^2$). Individual entities in
this structure is like a cluster. Periodic multilayers have periodicity only in
the direction normal to the multilayer surface. However, Fourier transform of
the XTEM images of the sample irradiated at the highest-fluence shows new
off-normal Fourier components of superlattice periodicities arising due to ion
irradiation. With a proper understanding of this phenomenon it may be possible
to fabricate three dimensional periodic structures of nanoclusters.

27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics