This work aims to bring together the current state of the art in the topical area of nanomagnetism to create an accessible integrated synthesis of our current understanding of the functional magnetisation processes in nanomagnetic systems. A central theme is the linkages between material properties, physical structure, and the resulting magnetisation behaviour that emerges. Embracing thin-films and multilayers and with a focus on lithographically defined nanoscale structures along with nanoparticles, cylindrical nanowires and related 3-D nanostructures. The focus is on metallic ferromagnets and where appropriate, for example nanoparticles, will also cover ferrimagnetic oxides. The discussion of magnetisation processes will range from precessional magnetisation dynamics and damping through to magnetic domain wall, vortex and skyrmion structures and magnetisation behaviour.