Summary This chapter presents a micromagnetic study on domain walls (DW) dynamics in ferromagnetic nanotubes. In analogy to the well-established charge currents, a pure spin current is the directed flow of spin angular momentum. Further understanding of complex materials, such as agnetic alloys and metallic multilayers or multiferroics, requires an experimental technique that allows testing the electronic and magnetic properties of a targeted material element-selectively on femtosecond time scales and with nanometer lateral resolution. The chapter describes the ultrafast inverse Faraday effect (IFE) via the stimulated Raman scattering process by the solution of the time-dependent Schrödinger equation. The spin relaxation in non-magnetic metallic thin films is an important effect in spintronics, especially due to the decreasing dimensionality of magnetic multilayers. Using the Korringa-Kohn-Rostoker Green function method, the Elliott-Yafet parameter as well as the spin relaxation time by adding adatom impurities are calculated for 5d transition-metal ultrathin films.