Anisotropy of the optical and magneto-optical response of Au/Co/Au/Cu multilayers grown on vicinal Si (111) surfaces

Optical and magneto‐optical study of the Au/Co/Au/Cu multilayer grown on vicinal Si (111) surfaces

“…In this case, the azimuthal measurements show only three main lobes and not six as observed in Fig. 3, due to the presence of an isotropic term in the expression of the intensity [10]. In Fig.…”

“…The results show a very strong effect of the misorientation angle on the observed anisotropy: for the vicinal surfaces the threefold symmetry is clearly broken. A more detailed analysis of the experimental results shows the interference of a step-induced C 1v symmetry with the underlying C 3v symmetry of the Si (111) [10]. In order to check the propagation of the vicinal character of the Si substrate through the metallic multilayer, we have studied the evolution of azimulhal reflectivity as a function of Au thickness in Au/Cu/Si (111) 2° off.…”

“…These islands are locally arranged along crystallographic directions of the Si substrate (along the step edges and two equivalent directions <-110>). For Cu growth at 200 °C, the crystallinity is better pronounced and the surface is flatter [10]. This morphological difference between the two Cu buffer layers will surely affect the magnetic properties of the metallic multilayer.…”

FMR study of ultrathin Co magnetic films on vicinal Si(1 1 1) substrates

“…As observed, the shape of Hrðy H Þ function strongly depends on j H : in relation to the sample plane, the Hrðy H Þ is almost symmetric for j H near 0 and asymmetric for other j H : The Hrðy H ; j H Þ symmetry is unexpected for HCP Co grown on Au (1 1 1). However, a similar symmetry was observed in our sample by secondharmonic generation experiments and correlated to the structural symmetry sample [1]. In order to fit these experimental data, we considered the following expression for magnetic anisotropy energy: E A ðy; jÞ ¼ K 1 ð 1 4 sin 4 y þ 1 3 cos 4 y À ffiffi 2 3 q sin 3 y cos y sin 3jÞ…”

“…These islands present a quasi-hexagonal shape with typically 10 nm lateral dimension, and are locally arranged along the symmetry directions of Si substrate (along the step edges or an equivalent direction at 60 ). The structural symmetry of samples has been controlled by both STM and second-harmonic generation azimuthal reflectivity experiments [1].…”