Abstract
In a recent study Ferriani et al. (Phys. Rev. Lett. 99 (2007) 187203) investigated the possibility of tuning the magnetic order of the Fe monolayer on the disordered bcc-TaxW1-x(001) surface. We extend this study by constructing the effective two-dimensional Heisenberg Hamiltonian which describes exchange interactions in the iron monolayer. We investigate the exchange integrals for a large number of Fe—Fe pairs in the overlayer as a function of the composition of the alloy substrate. We investigate the crossover between the ferromagnetic and antiferromagnetic state from the point of view of the stability of the Heisenberg Hamiltonian with respect to magnon excitations. The present study is aimed at deeper understanding of the character of magnetic phase transition in the Fe overlayer due to band filling in the alloy substrate. [DOI: 10.1380/ejssnt.2010.157]
