Microwave absorption and 57Fe Mössbauer properties of Ni-Ti doped barium hexaferrite

The impact of doping the Fe component of barium hexaferrite with Ni0.5Ti0.5 is investigated using x-ray powder diffraction, 57Fe Mossbauer spectroscopy and microwave network analysis. The dopant ions exhibit a preference for the 2b, 4f 2 and 12k-sites and the unit cell volume is observed to decrease. The ferromagnetic resonance frequency is reduced by about 11.5 GHz for each additional dopant ion per formula unit.