title: Oscillatory curie temperature of two-dimensional ferromagnets.
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.
authors.affiliation: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Pajda
authors.forename: J
authors.initials: J
authors.lastname: Kudrnovský
authors.forename: I
authors.initials: I
authors.lastname: Turek
authors.forename: V
authors.initials: V
authors.lastname: Drchal
authors.forename: P
authors.initials: P
authors.lastname: Bruno