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The electromagnetic microwave absorption properties of Barium M-type ferrite, in which Fe 3+ was substituted by (Ti 0.5 Mn 0.5 ) 3+ , were investigated in the GHz frequency range. The anisotropy field (H A ) of Barium M-type ferrite can be changed by varying the Ti 0.5 Mn 0.5 content, which enables the natural resonance frequency (fr) to be controlled, in the range 48 GHz to 8 GHz. BaFe 12-x (Ti 0.5 Mn 0.5 ) x O 19 sintered ferrites with compositions x=2.5 to 5 exhibited good microwave absorption properties, with minimum reflection losses (R.L. ) less than - 20 dB in 1 to 20 GHz frequency range, for matching thicknesses (dm) of 0.5 to 3.8 mm. BaFe 12-x (Ti 0.5 Mn 0.5 ) x O 1 ferrite-resin composites with 70 mass% ferrite, exhibited wide bandwidths with R.L. < -20 dB. In particular, the composite samples with compositions x=3 and x=4 had wide bandwidths of 14.1 to ∼ 20 GHz and 7.4 to 12.0 GHz, for matching thicknesses of 1. 6 mm and 2.7 mm, respectively. These matching thicknesses were smaller than for conventional spinel ferrites. It may be concluded that Barium M-type ferrite is a good candidate for a thin electromagnetic microwave absorber in the GHz range. This is the first study to show that it is possible to use the natural resonance of M-type ferrite for the absorption of microwave radiation.

Barium M-type Ferrite as an Electromagnetic Microwave Absorber in the GHz Range