Abstract
Polycrystalline samples of M-type hexaferrites BaFe 12−2 x Ru x Zn x O 19 and BaFe 12−2 x Ru x Co x O 19 with 0⩽ x⩽0.45 have been prepared by a classical sintering method. The evolutions with x of the cell parameters, the saturation magnetization and the magnetic transition temperature have been measured; in this range of small doping ratios, saturation magnetization and Curie temperature of substituted hexaferrites remain close to those of the undoped BaFe 12O 19. X-ray diffraction measurements on oriented powders show that a change of magnetocrystalline anisotropy from axial to planar occurs in both cases for a small substituting ratio x c=0.375. Microwave electromagnetic characteristics have been studied on the ceramic samples from 0.1 to 10 GHz. The behaviour of the magnetic losses ( μ″) corroborates the anisotropy change when doping; a convolution of the dissipation mechanisms (domain wall motions and gyromagnetism) is obtained for x c. The level of the magnetic losses is discussed in relation with others substituted Ba-hexaferrites.
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