Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Skyrmion Bundles and Their Current-Driven Dynamics   Quantization of topological charges determines the various topological spin
textures that are expected to play a key role in future spintronic devices.
While the magnetic skyrmion with a unit topological charge Q has been
extensively studied, spin textures with other integer valued have not been
verified well so far. Here, we report the real-space image, creation, and
manipulation of a type of multi Q three-dimensional skyrmionic texture, where a
circular spin spiral ties a bunch of skyrmion tubes. We define these objects as
skyrmion bundles, and show they have arbitrarily integer values Q from negative
up to at least 55 in our experiment. These textures behave as quasiparticles in
dynamics for the collective motions driven by electric pulses. Similar to the
skyrmion, skyrmion bundles with non zero Q exhibit the skyrmion Hall effects
with a Hall angle of 62 degree. Of particular interest, the skyrmion bundle
with Q = 0 propagates collinearly with respect to the current flow without the
skyrmion Hall effect. Our results open a new perspective for possible
applications of multi Q magnetic objects in future spintronic devices.

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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg