Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Eigen power-flow-density vortices of magnetostatic modes in thin ferrite
  disks   In confined magnetically ordered structures one can observe vortices of
magnetization and electromagnetic power flow vortices. There are topologically
distinct and robust states. In this paper we show that in a normally magnetized
quasi-2D ferrite disk there exist eigen power-flow-density vortices of
magnetic-dipolar-mode oscillations. Because of such circular power flows, the
oscillating modes are characterized by stable magnetostatic energy states and
discrete angular moments of the wave fields. We show that the
power-flow-density vortices of magnetostatic modes can be excited by
electromagnetic fields of a microwave cavity. There is a clear correspondence
between the power-flow-density vortex structures in a ferrite disk derived from
an analytical solution of the magnetostatic-wave spectral problem and obtained
by the numerical-simulation electromagnetic program.

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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex