Oscillatory curie temperature of two-dimensional ferromagnets |
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Authors: | Pajda M Kudrnovský J Turek I Drchal V Bruno P |
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Institution: | Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany. |
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Abstract: | 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. |
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