Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: THz-driven demagnetization with Perpendicular Magnetic Anisotropy:
  Towards ultrafast ballistic switching   We study THz-driven spin dynamics in thin CoPt films with perpendicular
magnetic anisotropy. Femtosecond magneto-optical Kerr effect measurements show
that demagnetization amplitude of about $1\%$ can be achieved with a peak THz
electric field of $300$~kV/cm, and a corresponding peak magnetic field of
$0.1$~T. The effect is more than an order of magnitude larger than observed in
samples with easy-plane anisotropy irradiated with the same field strength. We
also utilize finite-element simulations to design a meta-material structure
that can enhance the THz magnetic field by more than an order of magnitude,
over an area of several tens of square micrometers. Magnetic fields exceeding
$1$~Tesla, generated in such meta-materials with the available laser-based THz
sources, are expected to produce full magnetization reversal via ultrafast
ballistic precession driven by the THz radiation. Our results demonstrate the
possibility of table-top ultrafast magnetization reversal induced by THz
radiation.

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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys