  The applications of exchange coupled bi-magnetic hard/soft and soft/hard
ferromagnetic core/shell nanoparticles are reviewed. After a brief description
of the main synthesis approaches and the core/shell structural-morphological
characterization, the basic static and dynamic magnetic properties are
presented. Five different types of perspective applications, based on diverse
patents and research articles, are described: permanent magnets, recording
media, microwave absorption, biomedical applications and other applications.
Both the advantages of the core/shell morphology and some of the remaining
challenges are discussed.
