Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of Pinned Magnetic Vortices   We observe the dynamics of a single magnetic vortex in the presence of a
random array of pinning sites. At low excitation amplitudes, the vortex core
gyrates about its equilibrium position with a frequency that is characteristic
of a single pinning site. At high amplitudes, the frequency of gyration is
determined by the magnetostatic energy of the entire vortex, which is confined
in a micron-scale disk. We observe a sharp transition between these two
amplitude regimes that is due to depinning of the vortex core from a local
defect. The distribution of pinning sites is determined by mapping fluctuations
in the frequency as the vortex core is displaced by a static in-plane magnetic
field.

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The categories of this paper are: cs
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci