Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric field-driven topological phase switching and skyrmion lattice
  metastability in magnetoelectric Cu$_{2}$OSeO$_{3}$   Due to their topological protection and nanometric size, magnetic skyrmions
are anticipated to form components of new high-density memory technologies. In
metallic systems skyrmion manipulation is achieved easily under a low density
electric current flow, although the inevitable thermal dissipation ultimately
limits the energy efficacy of potential applications. On the other hand, a near
dissipation-free skyrmion and skyrmion phase manipulation is expected by using
electric \emph{fields}, thus meeting better the demands of an energy-conscious
society. In this work on an insulating chiral magnet Cu$_{2}$OSeO$_{3}$ with
magnetoelectric coupling, we use neutron scattering to demonstrate directly i)
the creation of metastable skyrmion states over an extended range in magnetic
field and temperature, and ii) the in-situ electric field-driven switching
between topologically distinct phases; the skyrmion phase and a competing
non-topological cone phase. For our accessible electric field range, the phase
switching is achieved in a high temperature regime, and the remnant (E=0)
metastable skyrmion state is thermally volatile with an exponential lifetime on
hour timescales. Nevertheless, by taking advantage of the demonstrably
longer-lived metastable skyrmion states at lower temperatures, a truly
non-volatile and near dissipation-free topological phase change memory function
is promised in magnetoelectric chiral magnets.

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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol