DEIMOS, Dichroism Experimental Installation for Magneto-Optical Spectroscopy, is a beam-line dedicated to the study of the magnetic and electronic properties using polarized light. The application of synchrotron radiation to magnetism is related to the development of circularly polarized sources. The main advantage of X-ray Magnetic Circular Dichroism (XMCD) over other techniques addressing magnetic behavior lies in its chemical and orbital selectivity. One can probe the magnetic moment of one specific atom in a compound in which the absorbing atom is not a major component. Due to the electric dipole nature of the Hamiltonian interaction, one can also probe specific shells for which the magnetic orbital and magnetic spin moments can be “independently” measured. New physical and chemical properties shown by different classes of materials provide the basis for promising applications and challenging scientific investigations. The knowledge of the electronic structure of these materials is of crucial importance for the understanding and tailoring of well defined properties, like transport, magnetism and others.