Complex crystal structure. U-type hexaferrites have the most complex structure among all hexagonal ferrites and a large unit cell size. Unique structural, dielectric and magnetic properties. Possibility of changing characteristics. Modification of the composition of U-type hexaferrites using different elements (transition, rare earth or their combination) affects the crystal structure and, accordingly, the properties of the material. Good electromagnetic properties. U-type hexaferrites have excellent properties in the microwave region of the electromagnetic spectrum.