I. INTRODUCTION Due to the achievements in science and technology toward miniaturization of devices into the nano-meter length scale within the last decade, the physics of nano-structures, interfaces, and surfaces is nowadays a central area of research.1,21. F. Hellman, A. Hoffmann, Y. Tserkovnyak, G. S. Beach, E. E. Fullerton, C. Leighton, A. H. MacDonald, D. C. Ralph, D. A. Arena, H. A. Dürr, P. Fischer, J. Grollier, J. P. Heremans, T. Jungwirth, A. V. Kimel, B. Koopmans, I. N. Krivorotov, S. J. May, A. K. Petford-Long, J. M.