  The use of magneto-optical techniques to tune the plasmonic response of
nanostructures is a hot topic in active plasmonics, with fascinating
implications for several plasmon-based applications and devices. For this
emerging field, called magnetoplasmonics, plasmonic nanomaterials with strong
optical response to magnetic field are desired, which is generally challenging
to achieve with pure noble metals. To overcome this issue, several efforts have
been carried out to design and tailor the magneto-optical response of metal
nanostructures, mainly by combining plasmonic and magnetic materials in a
single nanostructure. In this tutorial we focus our attention on
magnetoplasmonic effects in purely plasmonic nanostructures, as they are a
valuable model system allowing for an easier rationalization of
magnetoplasmonic effects. The most common magneto-optical experimental methods
employed to measure these effects are introduced, followed by a review of the
major experimental observations that are discussed within the framework of an
analytical model developed for the rationalization of magnetoplasmonic effects.
Different materials are discussed, from noble metals to novel plasmonic
materials, such as heavily doped semiconductors.
