Metamaterials based on nanostructured ferromagnetics are interesting due to the richness of the physics of wave phenomena. They are also considered as potential candidates for a number of important applications, such as microwave signal treatment and magneto-optical light modulation. Magnetic dynamic properties of such systems can be varied over a very wide range by independently modifying the shape and the size of nano-elements, their separation, their chemical composition as well as the nature of the matrix.