Hamburg 2001 – wissenschaftliches Programm

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AM: Magnetismus

AM 12: Oberfl
ächenmagnetismus

AM 12.8: Vortrag

Donnerstag, 29. März 2001, 11:15–11:30, S 5.4

Oscillatory Curie temperature of two-dimensional ferromagnets — •Patrick Bruno¹, Josef Kudrnovský^1,2, Marek Pajda¹, Vaclav Drchal², and Ilja Turek³ — ¹Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle — ²Institute of Physics, Czech Academy of Sciences, Prague — ³Institute of Physics of Materials, Czech Academy of Sciences, Brno

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.