Phys. Rev. Lett. 85, 5424–5427 (2000)Oscillatory Curie Temperature of Two-Dimensional FerromagnetsReceived 27 July 2000; published in the issue dated 18 December 2000 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.5424
DOI:
10.1103/PhysRevLett.85.5424
PACS:
75.10.-b, 71.15.-m, 75.30.Ds, 75.70.Ak
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