This book presents the special properties of low-dimensional magnetic systems i.e., film, multilayers, fine particles, nanostructured materials, and reflecting the recent researches. It is divided into four parts: (i) contains a phenomenological description of the fundamentals of magnetism; (ii) covers preparation and properties of films and multilayers, with special emphasis on Giant Magnetoresistance; (iii) focuses on fine particles and nanostructured systems; and (iv) dedicated to innovative magnetic materials for the next generation.