Abstract
In this chapter, the magnetic imaging of cylindrical nanowires issue is addressed. The macro- and mesoscopic scale techniques for the observation of magnetic domains and domain walls must be replaced when reducing the dimensions to the nanoscale level. The small dimensions and the cylindrical geometry of nanowires (NWs) induce such technical difficulties that the magnetization distribution imaging is only possible with the help of sophisticated advanced techniques. Despite these challenges, qualitative and quantitative results have been obtained in the last years by using techniques as electron holography, magnetic circular dichroism combined with photoemission electron microscopy, magnetic force microscopy or more recently the nitrogen-vacancy centre in diamond tip. These techniques have revealed the existence of longitudinal, transversal, and vortex-like domain configuration and different domain walls structures in isolated nanowires. Moreover, the magnetic imaging techniques are very useful not only to visualize the distributions in domains at remanence but also to follow the magnetization reversal processes under applied magnetic field.
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