Oscillatory Curie Temperature of Two-Dimensional Ferromagnets

M. Pajda; J. Kudrnovský; I. Turek; V. Drchal; P. Bruno

doi:10.1103/PhysRevLett.85.5424

Oscillatory Curie Temperature of Two-Dimensional Ferromagnets

M. Pajda, J. Kudrnovský, I. Turek, V. Drchal, and P. Bruno

Phys. Rev. Lett. 85, 5424 – Published 18 December 2000

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.

Received 27 July 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.5424

Authors & Affiliations

M. Pajda¹, J. Kudrnovský^1,2, I. Turek³, V. Drchal², and P. Bruno¹

¹Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
²Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18221 Prague 8, Czech Republic
³Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, CZ-61662 Brno, Czech Republic