Pajda M, Kudrnovský J, Turek I, Drchal V, Bruno P
Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
Phys Rev Lett. 2000 Dec 18;85(25):5424-7. doi: 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.
从第一性原理出发，在实空间中计算了由不同厚度的铜帽层覆盖的磁性覆盖层Fe/Cu(001)和Co/Cu(001)的有效交换相互作用。构建了有效的二维海森堡哈密顿量，并用于在平均场和随机相位近似下估计磁振子色散定律、自旋波刚度常数和覆盖层居里温度。覆盖层居里温度作为帽层厚度的函数振荡，与最近的实验定性一致。
