Nonlinear Magneto-Optical Effect in Fe/Au Superlattices modulated by Non-Integer Atomic Layers

Katsuaki Sato, Akihiro Kodama, Masaaki Miyamoto, Koki Takanashi*, Hiroyasu Fujimori*, and Theo Rasing**

JAP (2000) to be published

Magnetic second harmonic generation (MSHG) signals from the Fe/Au superlattices grown on MgO (100) substrate have been investigated. The measurements were carried out in the longitudinal Kerr geometry with a 45-incidence. The magnetic field of }0.2 T was applied to provide a magnetic saturation. The polar plot of azimuth-dependence of the MSHG intensity showed a four-fold symmetry pattern similar to that observed in Fe/Au superlattices modulated by integer atomic layers. Azimuthal patterns show 45-rotation by reversing the magnetic field. Nonlinear Kerr rotation angle of 23.2 degrees was observed in the x=3.75 superlattice.