Critical Temperatures of Random Iron–Cobalt Overlayers on the fcc-Cu(001) Substrate
We have theoretically investigated thermodynamic properties of random iron–cobalt monolayer deposited on the fcc(001) face of copper. The effective two-dimensional Heisenberg Hamiltonian was constructed from first principles and used to estimate the Curie temperature. The random-phase approximation as well as Monte Carlo approach are used and critically compared. Calculations indicate a weak maximum of the Curie temperature for Fe-rich composition of the overlayer.
KeywordsCurie temperature Random overlayer Heisenberg Hamiltonian First principles Monte Carlo simulations
The authors acknowledge the support from the Czech Science Foundation under Contract No. 202/09/0775. L. B. acknowledges the support from the Swedish e-Science Research Centre (SeRC) and Swedish Research Council (VR).
- 9.Uppsala Atomistic Spin Dynamics project. http://www.physics.uu.se/en/page/UppASD