Oscillatory curie temperature of two-dimensional ferromagnets.

نویسندگان

  • M Pajda
  • J Kudrnovský
  • I Turek
  • V Drchal
  • P Bruno
چکیده

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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عنوان ژورنال:
  • Physical review letters

دوره 85 25  شماره 

صفحات  -

تاریخ انتشار 2000