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.
Pajda
M
M
Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
Kudrnovský
J
J
Turek
I
I
Drchal
V
V
Bruno
P
P