Magnetron sputtering is a mature technique for the deposition of thin films, both at laboratory and industrial level. Conceptually, the technique is quite simple and the process can be summarized in a few lines. A gas discharge is ignited by the application of a high voltage between a cathode and an anode. To increase the ionization efficiency of the electrons emitted from the cathode, a magnetic field is generated by a set of magnets placed behind the cathode. The ions present in the plasma,...