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Magnetic properties were studied on polycrystalline composite mixtures of magnetoplumbite-type BaFe12O19 and W-type BaCo2Fe16O27 ferrites with α-Fe2O3. The respective ferrite mixtures were prepared with hematite in 0 to 70 mol% using solid state reaction. X-ray diffraction (XRD) analysis and magnetic measurement suggested the products were simple mixtures of the ferromagnetic BaFe12O19 or BaCo2Fe16O27 with α-Fe2O3 even after sintering at 1250°C. Their magnetization decreased with the increasing contents of α-Fe2O3. Their electrical resistivities of higher than 102 Ωm were too large to observe their magnetic field dependence, magnetoresistance (MR) effect. Electrical resistivity decreased to 0.36 Ωm by the post annealing of the as prepared BaCo2Fe16O27 with a small amount of α-Fe2O3 in Ar at 1000°C for 5 h. The improved electrical conductivity in 4 orders of magnitude showed the MR effect of 0.86% on the post annealed BaCo2Fe16O27 product.

Magnetoplumbite and W-type barium ferrites as magnetic mixture with hematite