Studies of static, high-frequency and electromagnetic attenuation properties for Y-type hexaferrites Ba2CuxZn2−xFe12O22Ba2CuxZn2−xFe12O22 and their composites

• Confirm the anisotropy types of Y-type hexaferrites Ba2CuxZn2−xFe12O22Ba2CuxZn2−xFe12O22.
• Observe and explain Ms characteristics with Cu substitution.
• Cu substitution can enhance the permeability of Y-type hexaferrite composites
• The composite with Cu=1 has the optimum absorption properties.
• The composites are potential candidates for EM applications at S and C bands.

The static and dynamic magnetic properties as well as EM (electromagnetic) attenuation characteristics at microwave bands have been studied for Y-type hexaferrites Ba2CuxZn2−xFe12O22Ba2CuxZn2−xFe12O22 with x=0–2 and their silicone composites. The results show that the hexaferrites have c-plane anisotropy for x=0–1.5 and c-axis anisotropy for x  =2. Cu substitution can enhance μ0′ and μmax″ from 4.1 and 1.5 to the maximum 5.4 and 2.2, respectively, for Ba2CuxZn2−xFe12O22Ba2CuxZn2−xFe12O22 composites with x=0 and 1. Due to the enhanced permeability, EM attenuation properties of the composites are significantly improved. The composite with x  =1 has the optimum EM properties with relative bandwidth WR=3.7WR=3.7 at thickness t=0.40 cm for RL≤−10dB, as compared to WR=2.7WR=2.7 for the composite without Cu substitution. Ba2CuxZn2−xFe12O22Ba2CuxZn2−xFe12O22 composites are potential candidates for use as EM attenuation materials with low return loss and broad bandwidth at microwave S and C bands.