Dynamical magnetic excitations in adatoms and dimers on metallic surfaces*

There is hardly any method which has shaped nanoscience and nanotechnology more profoundly than the scanning tunneling microscope. Such a tool is used nowadays to probe spin-excitations in nano-objects[1,2,3,4]. A key quantity describing these excitations is the transverse dynamical magnetic susceptibility that we calculate using the Korringa-Kohn-Rostoker Green function method within the framework of time-dependent density functional theory[5]. The behavior of adatoms and dimers will be discussed and comparison to experimental works will be provided when available. \\[4pt] [1] C. F. Hirjibehedin {\it et al.}, Science 317, 1199 (2007)\newline [2] T. Balashov {\it et al.}, Phys. Rev. Lett. 102, 257203 (2009)\newline [3] A. A. Khajetoorians {\it et al.}, Phys. Rev. Lett. 106, 037205 (2011)\newline [4] B. Chilian {\it et al.}, Arxiv:1108.2443\newline [5] S. Lounis {\it et al.}, Phys, Rev, Lett. 105, 187205 (2010); Phys. Rev. B 83, 035109 (2011)