Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Competing Exchange Interactions in the Multiferroic and Ferrimagnetic
  CaBaCo$_4$O$_7$   Competing exchange interactions can produce complex magnetic states together
with spin-induced electric polarizations. With competing interactions on
alternating triangular and kagome layers, the swedenborgite CBO may have one of
the largest measured spin-induced polarizations of about 1700 nC/cm$^2$ below
its ferrimagnetic transition temperature at 70 K. Powder neutron-diffraction
data, magnetization measurements, and spin-wave resonance frequencies in the
THz range reveal that the complex spin order of multiferroic CBO can be
described as a triangular array of c-axis chains ferrimagnetically coupled to
each other in the ab plane. Magnetostriction on bonds that couple those chains
produces the large spin-induced polarization of CBO.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn