Magnetic and microwave absorption properties of BaMnxCo1-xTiFe10O19

For turning the magnetic resonance frequency and bandwidth of the reflection loss, different amounts of manganese (Mn) were incorporated into the BaCoTiFe10O19 for the substitution of cobalt (Co), then the BaMnxCo1-xTiFe10O19 was obtained via the solid-state reaction method. Subsequently, the effect of the doping Mn2+ on microwave absorption performances was detailedly studied in a frequency range from 2 to 18 GHz. The crystal volume expanded with increasing Mn2+ substitution as confirmed by X-ray diffraction results. No significant morphology change could be found in the scanning electron microscope images when Co2+ was partially substituted by Mn2+, but the coercivity and remanent magnetization raised as Mn2+ increased. The complex permittivity and permeability were collected by the vector net-analyzer and the absorbing properties were calculated according to transmission theory. The absorption peak shifted to higher frequencies with the substitution. The maximum loss value of -30.5 dB at 13.4 GHz was observed for the x = 0.6 sample. Based on the magnetic and microwave measurements, BaMnxCo1-xTiFe10O19 may be a good candidate for electromagnetic compatibility and other practical applications at high frequencies. (C) 2013 Elsevier B.V. All rights reserved.