Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Paramagnetic Meissner effect depending on superconducting thickness in
  Co/Nb multilayers   Paramagnetic Meissner Effect (PME) was observed in Co/Nb/Co trilayers and
multilayers. Measurements of the response to perpendicular external field near
the superconducting transition temperature were carried out for various Nb
thicknesses. PME was found only when layer thickness is no smaller than
penetration depth of Nb. A classical flux compression model [Koshelev and
Larkin, Phys. Rev. B 52, 13559 (1995)] was used to explain our data. We
inferred that the penetration depth was a critical length, below which
superconducting current density became too small and the PME could not be
achieved.

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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph