Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ferroelectric and Magnetic Domains in LuFe2O4 Observed by Scanning Probe
  Microscopy   LuFe2O4 is a multiferroic system which exhibits ferroelectricity, charge
order, and ferrimagnetic order simultaneously below ~230 K. The ferroelectric
domains of LuFe2O4 are imaged with both piezoresponse force microscopy (PFM)
and electrostatic force microscopy (EFM), while the magnetic domains are
characterized by magnetic force microscopy (MFM). Comparison of PFM and EFM
results lead to a conclusion that the ferroelectricity is of electronic origin
as opposed to the usual displacive one. Simultaneous characterization of
ferroelectric and magnetic domains by EFM and MFM, respectively, on the same
surface of LuFe2O4 reveals that both domains have irregular patterns of similar
shape, but the length scales are quite different. The domain size is
approximately 100 nm for the ferroelectric domains while the magnetic domain
size is much larger and gets as large as 1{\mu}m. We also demonstrate that the
origin of the formation of irregular domains in LuFe2O4 is not extrinsic but
intrinsic.

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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas