This book provides a complete introduction to nanomagnets and gives researchers the tools they need to create a new generation of nanoscale magnetic systems. Coverage begins with the origin of magnetism, domains in bulk magnets and the basic equation describing magnetization dynamics. It then turns to patterned nanoscale magnets, static magnetization structures and magnetic exchange interactions, followed by the dynamics of magnetism in nanostructures, spin torque and magnetic noise. It closes with a detailed look at existing and near-future applications.