Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Domains in Three-dimensional Ferroelectric Nanostructures: Theory and
  Experiment   Ferroelectric random access memory cells (FeRAMs) have reached 450 x 400 nm
production (0.18 micron^2) at Samsung with lead zirconate-titanate (PZT), 0.13
micron^2 at Matsushita with strontium bismuth tantalate (SBT), and comparable
sizes at Fujitsu with BiFeO3. However, in order to increase storage density,
the industry roadmap requires by 2010 that such planar devices be replaced with
three-dimensional structures. Unfortunately, little is known yet about even
such basic questions as the domain scaling of 3-d nanodevices, as opposed to
2-d thin films. Here we report the experimental measurement of nano-domains in
ferroelectric nanocolumns, together with a theory of domain size in 3-d
structures which explains the observations.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics