An Algebraic Approach to Green Functions for Surface, Interface and Overlayer Magnetism

Y. Zheng；D. L. Lin；Hao Che

Chinese Journal of Physics

33卷3期（1995 / 06 / 01）

197 - 212

英文

The Gaussian elimination and back substitution formalism is employed to study magnetic lattices involving surfaces and interfaces. On the nearest neighbor interaction of Heisenberg model, it is shown that exact Green's functions for any spin layer can be found in analytical form. Surface and interface spin wave spectra as well as the surface magnetization at low temperatures are calculated for systems with variable exchange coupling strengths. The recently observed substrate-induced magnetization in over-layers is also found. The advantages and limitations of the method. in general are discussed.