Magnetic properties of <i>X</i>-type Ba2Me2Fe28O46 (Me=Fe, Co, and Mn) hexagonal ferrites

Abstract

Polycrystalline samples of X-type Ba2Me2Fe28O46 (Me2-X, Me=Fe, Co, and Mn) hexagonal ferrite have been prepared by the classic ceramic method. Low-temperature magnetic properties, Curie temperatures, and distribution of divalent cations were studied. The substitution of Fe2+ ions with Co2+ and Mn2+ ions causes a decrease of the spontaneous moment μ and the Curie temperature Tc of X-type hexaferrites. The lower μ and Tc of Co2-X hexaferrite originate from the smaller magnetic moment of Co2+ ions. In the case of Mn2-X, the lower μ may be due to the valence state of Mn and the lower Tc may be caused by the fact that the space distribution of 3d electrons of Mn is different from that of Fe. In the Co2-X and Fe2-X compounds the Co2+ and Fe2+ ions enter the octahedral sites of spinel S blocks.