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Oscillatory Curie temperature of two-dimensional ferromagnets

Marek Pajda·Josef Kudrnovsky·Ilja Turek·Vaclav Drchal·Patrick Bruno
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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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Marek Pajda, Josef Kudrnovsky, Ilja Turek, Vaclav Drchal, Patrick Bruno. 2000-12-13. Oscillatory Curie temperature of two-dimensional ferromagnets. https://doi.org/10.1103/physrevlett.85.5424

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