Abstract
The magnetic resonance frequency of SrFe12O19 hexaferrites is above 40 GHz due to a very high magnetic anisotropy. Therefore, they are not suitable as absorbing materials in the frequency range of 1–18 GHz. Doping with Zn and Ru (SrFe12-2xZnxRuxO19) decreases the magnetic anisotropy and can bring the resonance frequency below 18 GHz improving the microwave absorption in lower frequency band. Both the imaginary and real parts of the permittivity increase and the magnetic loss tangent has a wide peak for x ≥ 0.3, which is twice the dielectric loss tangent. Both of them contribute to the microwave absorption. For this level of doping, the microwave absorption is significant in a wide frequency range. For x = 0.5 and the sample layer of 1.7–4.8 mm thick, the absorption bandwidth (RL < −10 dB) is from 4.3 GHz to 18 GHz. For a single-layer of 1.9 mm, the absorption bandwidth is from 10.1 to 18 GHz. The broad absorption is due to tunable magnetic anisotropic field by the Zn and Ru doping. The detailed analysis also shows that the impedance matching plays an important role in improving the absorbing band.
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