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MA: Magnetismus

MA 8: Surface Magnetism

MA 8.9: Talk

Monday, March 27, 2006, 17:00–17:15, HSZ 103

Probing surface magnetism using nonlinear optics: an ab initio study of Fe/W(110) — •Torsten Andersen and Wolfgang Hübner — Fachbereich Physik, TU Kaiserslautern, Box 3049, 67653 Kaiserslautern

The nonlinear optical response of a structurally optimized Fe/W(110) thin film is investigated numerically using ab initio methods. The thin films consist of a monolayer of Fe on top of four monolayers of W, with different directions of the magnetization in the Fe layer. The calculation is based on eigenstates obtained using the full-potential linearised augmented plane-wave method, converged self-consistently to an accuracy better than 10 µRy, including the spin-orbit interaction. The magnetic ground state shows an easy axis in the 110-direction, in agreement with experiment. From the eigenstates we are able to calculate the magneto-optical transition matrix elements, the nonlinear optical susceptibility, and the second-harmonic response.