Oscillatory Curie temperature of two-dimensional ferromagnets

Details Oscillatory Curie temperature of two-dimensional ferromagnets Oscillatory Curie temperature of two-dimensional ferromagnets

2000-07-27

arxiv.org/abs/cond-mat/0007446v3

Phys. Rev. Lett. 85, pp. 5424-5427 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX 3.1, 4 pages, 3 figures (PS files); v2: revised version; v3: reference added

Scientific paper

10.1103/PhysRevLett.85.5424

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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