Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillatory Curie temperature of two-dimensional ferromagnets   The effective exchange interactions of magnetic overlayers Fe/Cu(001) and
Co/Cu(001) covered by a Cu-cap layer of varying thickness were calculated in
real space from first principles. The effective two-dimensional Heisenberg
Hamiltonian was constructed and used to estimate magnon dispersion laws,
spin-wave stiffness constants, and overlayer Curie temperatures within the
mean-field and random-phase approximations. Overlayer Curie temperature
oscillates as a function of the cap-layer thickness in a qualitative agreement
with a recent experiment.

27
The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
16
The categories of this paper are: stat
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc