Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 15: Oberflächenmagnetismus

MA 15.5: Vortrag

Donnerstag, 14. März 2002, 16:15–16:30, H10

Ab-initio nonlinear magneto-optics of Fe/Cu(001): Substrate effects — •Torsten Andersen and Wolfgang Hübner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle (Saale)

We compute the nonlinear optical response of an Fe monolayer placed on top of a growing number of monolayers of Cu (001). Our calculation is based on eigenstates obtained within the full-potential linearized augmented plane-wave method (converged to better than 0.1mRy), adding spin-orbit interaction within second variation. This new set of eigenstates allows us to calculate the magneto-optical transition matrix elements. The second-harmonic response is determined in the reflection geometry with magnetization perpendicular to the surface using the surface-sheet model. Adding layers of a noble metal (Cu) to the Fe monolayer gives a new degree of freedom, and the energy bands show that such an addition converges essentially to an addition of d-states and a small broadening of the d-band with growing number of Cu layers. The screened nonlinear optical susceptibility is calculated and converges quite well with a growing number of Cu layers. Our results show that the magnetic tensor elements of the nonlinear optical response tensor are roughly of the same order of magnitude as the nonmagnetic ones in contrast to linear optics, where the magnetic response is only a minor correction.