ENHANCEMENT OF THE MAGNETOOPTICAL KERR ROTATION IN NONLINEAR-OPTICAL RESPONSE

Using an electronic theory we calculate the frequency-dependent nonlin ear magneto-optical Kerr rotation and show that the second harmonic po larization ellipsis is more strongly influenced by magnetism than in t he linear case. We find for the magnetization dependence of the nonlin ear and linear magneto-optical susceptibility tenser elements a linear dependence on magnetization. The influence of the symmetry of matrix elements for s or d transitions on the second harmonic intensity is di scussed. Furthermore, the at, initio nonlinear Ken spectra of Fe layer s of different thicknesses are presented.